diff --git a/.config/StartSch.run.xml b/.config/StartSch.run.xml
index b2b73e62..7d8ad232 100644
--- a/.config/StartSch.run.xml
+++ b/.config/StartSch.run.xml
@@ -1,5 +1,5 @@
 <component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="StartSch" type="LaunchSettings" factoryName=".NET Launch Settings Profile">
+  <configuration default="false" name="StartSch" type="LaunchSettings" factoryName=".NET Launch Settings Profile" activateToolWindowBeforeRun="false">
     <option name="LAUNCH_PROFILE_PROJECT_FILE_PATH" value="$PROJECT_DIR$/StartSch/StartSch.csproj" />
     <option name="LAUNCH_PROFILE_TFM" value="net10.0" />
     <option name="LAUNCH_PROFILE_NAME" value="http" />
diff --git a/StartSch/Components/Pages/AdminDashboardPage.razor b/StartSch/Components/Pages/AdminDashboardPage.razor
index bb70d07a..60a004d6 100644
--- a/StartSch/Components/Pages/AdminDashboardPage.razor
+++ b/StartSch/Components/Pages/AdminDashboardPage.razor
@@ -7,6 +7,7 @@
 
 @inject AuthorizationService AuthorizationService
 @inject InterestService InterestService
+@inject IDbContextFactory<Db> DbFactory
 
 <main>
     <Title>Adminisztráció</Title>
@@ -30,8 +31,29 @@
             }
 
         </ul>
+
+        <section style="margin-top: 24px">
+            <h2>Kollaborációs kérelmek</h2>
+            @if (_collaborationRequests.Count == 0)
+            {
+                <p>Nincs függő kérelmed.</p>
+            }
+            else
+            {
+                <ul>
+                    @foreach (var request in _collaborationRequests)
+                    {
+                        <li>
+                            <a href="/collaboration-requests/@request.Id">
+                                @DescribeRequest(request)
+                            </a>
+                        </li>
+                    }
+                </ul>
+            }
+        </section>
     }
-    
+
     <p style="margin-top: 16px">
         Azokat a köröket adminisztrálhatod, amelyiknél
         <a href="https://pek.sch.bme.hu">PéK-en </a>
@@ -49,11 +71,34 @@
 
 @code {
     private List<Page>? _administeredPages;
+    private readonly List<CollaborationRequest> _collaborationRequests = [];
 
     protected override async Task OnInitializedAsync()
     {
         var index = await InterestService.LoadIndex;
         _administeredPages = index.GetPages(AuthorizationService.AdministeredPageIds);
+
+        if (_administeredPages is not { Count: > 0 })
+            return;
+
+        await using var db = await DbFactory.CreateDbContextAsync();
+
+        _collaborationRequests.AddRange(await db.CollaborationRequests
+            .Where(r => AuthorizationService.AdministeredPageIds.Contains(r.PageId))
+            .Include(r => r.Page)
+            .Include(r => ((EventCollaborationRequest)r).Event)
+            .Include(r => ((PostCollaborationRequest)r).Post)
+            .OrderByDescending(r => r.Id)
+            .ToListAsync());
     }
 
+    private static string DescribeRequest(CollaborationRequest request) => request switch
+    {
+        EventCollaborationRequest eventRequest =>
+            $"Esemény: {eventRequest.Event.Title} -> {eventRequest.Page.GetName()}",
+        PostCollaborationRequest postRequest =>
+            $"Poszt: {postRequest.Post.Title} -> {postRequest.Page.GetName()}",
+        _ => $"Kérelem #{request.Id}"
+    };
+
 }
diff --git a/StartSch/Components/Pages/CollaborationRequestPage.razor b/StartSch/Components/Pages/CollaborationRequestPage.razor
new file mode 100644
index 00000000..540505a1
--- /dev/null
+++ b/StartSch/Components/Pages/CollaborationRequestPage.razor
@@ -0,0 +1,179 @@
+@attribute [Authorize]
+@page "/collaboration-requests/{CollaborationRequestId:int}"
+
+@using StartSch.Services
+
+@rendermode InteractiveServerWithoutPrerendering
+@layout MainLayout
+
+@inject IDbContextFactory<Db> DbFactory
+@inject AuthorizationService AuthorizationService
+@inject NavigationManager Navigation
+
+<main>
+    @if (_request == null)
+    {
+        <article class="post">
+            <h1>Kérelem nem található</h1>
+            <p>A keresett kollaborációs kérelem nem létezik, vagy már feldolgozták.</p>
+        </article>
+    }
+    else if (_targetPage == null || !AuthorizationService.CanAcceptCollaborationRequests(_targetPage))
+    {
+        <article class="post">
+            <h1>Nincs jogosultság</h1>
+            <p>Ehhez a kollaborációs kérelemhez nincs jogosultságod.</p>
+        </article>
+    }
+    else
+    {
+        <article class="post">
+            <h1>Kollaborációs kérelem #@_request.Id</h1>
+
+            <p>
+                Cél oldal:
+                <a href="/pages/@_targetPage.Id">@_targetPage.GetName()</a>
+            </p>
+
+            @if (_request is EventCollaborationRequest eventRequest)
+            {
+                <p>
+                    Típus: Esemény
+                    <br/>
+                    Tartalom: <a href="/events/@eventRequest.EventId">@eventRequest.Event.Title</a>
+                </p>
+            }
+            else if (_request is PostCollaborationRequest postRequest)
+            {
+                <p>
+                    Típus: Poszt
+                    <br/>
+                    Tartalom: <a href="/posts/@postRequest.PostId">@postRequest.Post.Title</a>
+                </p>
+            }
+
+            <div style="display: flex; gap: 8px; margin-top: 12px">
+                <expressive-button type="button" @onclick="() => Accept(_request!)" class="small filled round" disabled="@_isBusy">
+                    Elfogadás
+                </expressive-button>
+                <expressive-button type="button" @onclick="() => Deny(_request!)" class="small text round error standard" disabled="@_isBusy">
+                    Elutasítás
+                </expressive-button>
+                <expressive-button href="/dashboard" class="small text round" type="button" disabled="@_isBusy">
+                    Vissza
+                </expressive-button>
+            </div>
+        </article>
+    }
+</main>
+
+@code {
+    private CollaborationRequest? _request;
+    private Page? _targetPage;
+    private bool _isBusy;
+
+    [Parameter] public int CollaborationRequestId { get; set; }
+
+    protected override async Task OnInitializedAsync()
+    {
+        await using var db = await DbFactory.CreateDbContextAsync();
+
+        _request = await db.CollaborationRequests
+            .Where(r => r.Id == CollaborationRequestId)
+            .Include(r => r.Page)
+            .Include(r => ((EventCollaborationRequest)r).Event)
+            .Include(r => ((PostCollaborationRequest)r).Post)
+            .FirstOrDefaultAsync();
+
+        _targetPage = _request?.Page;
+    }
+
+    private async Task Accept(CollaborationRequest request)
+    {
+        if (_isBusy)
+            return;
+
+        _isBusy = true;
+        await using var db = await DbFactory.CreateDbContextAsync();
+
+        var page = await db.Pages
+            .Include(p => p.Categories)
+            .FirstOrDefaultAsync(p => p.Id == request.PageId);
+
+        if (page == null || !AuthorizationService.CanAcceptCollaborationRequests(page) || page.Categories.Count == 0)
+        {
+            _isBusy = false;
+            return;
+        }
+
+        var category = page.Categories[0];
+
+        if (request is EventCollaborationRequest evInfo)
+        {
+            var ev = await db.Events
+                .Include(e => e.Categories)
+                .FirstOrDefaultAsync(e => e.Id == evInfo.EventId);
+
+            if (ev != null)
+            {
+                if (!ev.Categories.Any(c => c.Id == category.Id))
+                    ev.Categories.Add(category);
+
+                var toRemove = await db.CollaborationRequests
+                    .FirstOrDefaultAsync(r => r.Id == request.Id && r.PageId == request.PageId);
+                if (toRemove != null)
+                    db.CollaborationRequests.Remove(toRemove);
+            }
+        }
+        else if (request is PostCollaborationRequest postInfo)
+        {
+            var post = await db.Posts
+                .Include(p => p.Categories)
+                .FirstOrDefaultAsync(p => p.Id == postInfo.PostId);
+
+            if (post != null)
+            {
+                if (!post.Categories.Any(c => c.Id == category.Id))
+                    post.Categories.Add(category);
+
+                var toRemove = await db.CollaborationRequests
+                    .FirstOrDefaultAsync(r => r.Id == request.Id && r.PageId == request.PageId);
+                if (toRemove != null)
+                    db.CollaborationRequests.Remove(toRemove);
+            }
+        }
+
+        await db.SaveChangesAsync();
+        _isBusy = false;
+        Navigation.NavigateTo("/dashboard");
+    }
+
+    private async Task Deny(CollaborationRequest request)
+    {
+        if (_isBusy)
+            return;
+
+        _isBusy = true;
+        await using var db = await DbFactory.CreateDbContextAsync();
+
+        var page = await db.Pages.FirstOrDefaultAsync(p => p.Id == request.PageId);
+        if (page == null || !AuthorizationService.CanAcceptCollaborationRequests(page))
+        {
+            _isBusy = false;
+            return;
+        }
+
+        var toRemove = await db.CollaborationRequests
+            .FirstOrDefaultAsync(r => r.Id == request.Id && r.PageId == request.PageId);
+        if (toRemove == null)
+        {
+            _isBusy = false;
+            return;
+        }
+
+        db.CollaborationRequests.Remove(toRemove);
+        await db.SaveChangesAsync();
+        _isBusy = false;
+        Navigation.NavigateTo("/dashboard");
+    }
+}
diff --git a/StartSch/Components/Pages/EventEditPage.razor b/StartSch/Components/Pages/EventEditPage.razor
index 5b7df930..13b99d67 100644
--- a/StartSch/Components/Pages/EventEditPage.razor
+++ b/StartSch/Components/Pages/EventEditPage.razor
@@ -12,6 +12,7 @@
 @inject NavigationManager Navigation
 @inject IServiceProvider ServiceProvider
 @inject AuthorizationService AuthorizationService
+@inject InterestService InterestService
 
 @if (!IsResourceAvailable(
          _event,
@@ -61,6 +62,47 @@
                 </label>
             </div>
 
+            <div style="margin-top: 16px;">
+                <div class="small filled round">
+                    Kollaboráló körök
+                </div>
+
+
+                @if (GetSelectedCollaborationPages().Count > 0)
+                {
+                    <div style="margin-top: 8px;">
+                        <md-chip-set aria-label="Kiválasztott kollaboráló körök" style="display: flex; flex-wrap: wrap; gap: 8px;">
+                            @foreach (var collabPage in GetSelectedCollaborationPages())
+                            {
+                                <md-input-chip remove-only @onclick="() => RemoveCollaborationPage(collabPage)">
+                                    @if (RequiresCollaborationRequest(collabPage))
+                                    {
+                                        <md-icon slot="icon" title="Kollaborációs kérelmet igényel">pending</md-icon>
+                                    }
+                                    @collabPage.GetName()
+                                </md-input-chip>
+                            }
+                        </md-chip-set>
+                    </div>
+                }
+
+                <div style="margin-top: 12px; display: flex; gap: 8px; align-items: center;">
+                    <expressive-button type="button" class="small text round" @onclick="OpenPagePicker">
+                        <md-icon slot="icon">add</md-icon>
+                        Kör hozzáadása
+                    </expressive-button>
+                </div>
+
+                @if (GetPagesRequiringRequest().Count > 0)
+                {
+                    <p class="small text" style="margin-top: 8px;">
+                        <md-icon style="vertical-align: middle;">pending</md-icon>
+                        Kollaborációs kérelmet igényel:
+                        @string.Join(", ", GetPagesRequiringRequest().Select(p => p.GetName()))
+                    </p>
+                }
+            </div>
+
             <div style="margin-top: 8px">
                 <label>
                     <span style="display: block">
@@ -100,7 +142,8 @@
                 @if (EventId != 0)
                 {
                     <div style="flex: 1"></div>
-                    <expressive-button href="@($"/events/{_event.Id}/delete")" class="small text round error standard" disabled="@_isBusy">
+                    <expressive-button href="@($"/events/{_event.Id}/delete")" class="small text round error standard"
+                                       disabled="@_isBusy">
                         <md-icon slot="icon">delete</md-icon>
                         Törlés
                     </expressive-button>
@@ -108,7 +151,7 @@
             </div>
         </EditForm>
     </Form>
-   
+
     <Previews>
         @{
             _event.Start = _model.Start?.ToLocalDateTime().InZoneLeniently(Utils.HungarianTimeZone).ToInstant();
@@ -120,12 +163,58 @@
     </Previews>
 </AdminShell>
 
-@code {
+@if (_isPagePickerOpen)
+{
+    <md-dialog open @onclose="ClosePagePicker">
+        <h2 slot="headline" style="margin: 0; line-height: 1.35; padding-top: 8px; padding-left: 16px; padding-bottom: 4px;">
+            Kör hozzáadása
+        </h2>
+
+        <form slot="content" id="event-page-picker-form" method="dialog" style="margin: 0; padding-top: 4px;">
+            @if (GetAddablePages().Count == 0)
+            {
+                <p>Nincs több hozzáadható kör.</p>
+            }
+            else
+            {
+                <md-list style="max-width: 100%;">
+                    @foreach (var addablePage in GetAddablePages())
+                    {
+                        <md-list-item>
+                            <div slot="headline">@addablePage.GetName()</div>
+                            @if (RequiresCollaborationRequest(addablePage))
+                            {
+                                <div slot="supporting-text">Kollaborációs kérelmet igényel</div>
+                                <md-icon slot="start" title="Kollaborációs kérelmet igényel">pending</md-icon>
+                            }
+                            <md-text-button slot="end" @onclick="() => AddCollaborationPage(addablePage.Id)">
+                                Hozzáadás
+                            </md-text-button>
+                        </md-list-item>
+                    }
+                </md-list>
+            }
 
+            <p class="small text" style="margin-top: 12px;">
+                <md-icon style="vertical-align: middle;">pending</md-icon>
+                Az ikonnal jelölt körök hozzáadása kollaborációs kérelmet hoz létre.
+            </p>
+        </form>
+
+        <div slot="actions">
+            <md-text-button form="event-page-picker-form" @onclick="ClosePagePicker">Bezárás</md-text-button>
+        </div>
+    </md-dialog>
+}
+
+@code {
     private Event? _event;
+    private Page? _parentPage;
     private readonly List<Event> _possibleParents = [];
     private readonly EventEditModel _model = new();
     private bool _isBusy;
+    private bool _isPagePickerOpen;
+    private List<Page> _allPages = [];
 
     [Parameter] public int EventId { get; set; }
 
@@ -139,7 +228,12 @@
     {
         await using var db = await DbFactory.CreateDbContextAsync();
 
-        if (EventId == 0) // new event
+        _allPages = await db.Pages
+            .Include(p => p.Categories)
+            .OrderBy(p => p.Name ?? p.PekName ?? p.PincerName)
+            .ToListAsync();
+
+        if (EventId == 0)
         {
             Event? parent = ParentId.HasValue
                 ? await db.Events
@@ -151,7 +245,7 @@
             if (ParentId.HasValue && parent == null)
                 return;
 
-            Event newEvent = new()
+            var newEvent = new Event
             {
                 Start = SystemClock.Instance.GetCurrentInstant(),
                 Title = "",
@@ -163,16 +257,16 @@
                 return;
 
             List<int> categoryIds = CategoryIds.Split(',').Select(int.Parse).ToList();
-
             List<Category> categories = await db.Categories
                 .Include(c => c.Page)
-                .Where(g => categoryIds.Contains(g.Id))
+                .Where(c => categoryIds.Contains(c.Id))
                 .ToListAsync();
             newEvent.Categories.AddRange(categories);
+            _model.CollaborationCategories = categories.ToList();
 
             _event = newEvent;
         }
-        else // editing
+        else
         {
             _event = await db.Events
                 .Include(e => e.Parent)
@@ -181,6 +275,25 @@
                 .FirstOrDefaultAsync(e => e.Id == EventId);
             if (_event == null)
                 return;
+
+            _model.CollaborationCategories = _event.Categories.ToList();
+
+            var requestedPageIds = await db.EventCollaborationRequests
+                .Where(r => r.EventId == _event.Id)
+                .Select(r => r.PageId)
+                .Distinct()
+                .ToListAsync();
+
+            var requestedCategories = await db.Categories
+                .Include(c => c.Page)
+                .Where(c => requestedPageIds.Contains(c.PageId) && c.Name == null)
+                .ToListAsync();
+
+            foreach (var category in requestedCategories)
+            {
+                if (_model.CollaborationCategories.All(c => c.Id != category.Id))
+                    _model.CollaborationCategories.Add(category);
+            }
         }
 
         _model.Start = (_event.Start ?? SystemClock.Instance.GetCurrentInstant())
@@ -192,6 +305,7 @@
                      ?? _model.Start;
         _model.Title = _event.Title;
         _model.DescriptionMarkdown = _event.DescriptionMarkdown;
+
         if (_event.Parent != null)
         {
             _possibleParents.Add(_event.Parent);
@@ -209,8 +323,8 @@
 
         Event savedEvent = await eventService.Save(
             EventId,
-            _event!.ParentId,
-            _event.Categories.Select(e => e.Id).ToHashSet(),
+            _model.ParentId,
+            _model.CollaborationCategories.Select(c => c.Id).ToHashSet(),
             _model.Title,
             _model.DescriptionMarkdown,
             _model.Start?.ToLocalDateTime().InZoneLeniently(Utils.HungarianTimeZone).ToInstant(),
@@ -220,6 +334,43 @@
         Navigation.NavigateTo($"/events/{savedEvent.Id}");
     }
 
+    private void OpenPagePicker() => _isPagePickerOpen = true;
+    private void ClosePagePicker() => _isPagePickerOpen = false;
+
+    private bool RequiresCollaborationRequest(Page page)
+        => !AuthorizationService.AdministeredPageIds.Contains(page.Id);
+
+    private List<Page> GetSelectedCollaborationPages()
+    {
+        var selectedPageIds = _model.CollaborationCategories.Select(c => c.PageId).ToHashSet();
+        return _allPages.Where(p => selectedPageIds.Contains(p.Id)).ToList();
+    }
+
+    private List<Page> GetPagesRequiringRequest()
+        => GetSelectedCollaborationPages().Where(RequiresCollaborationRequest).ToList();
+
+    private List<Page> GetAddablePages()
+    {
+        var selectedPageIds = _model.CollaborationCategories.Select(c => c.PageId).ToHashSet();
+        return _allPages.Where(p => !selectedPageIds.Contains(p.Id)).ToList();
+    }
+
+    private void AddCollaborationPage(int pageId)
+    {
+        var page = _allPages.FirstOrDefault(p => p.Id == pageId);
+        var category = page?.Categories.FirstOrDefault(c => c.Name == null) ?? page?.Categories.FirstOrDefault();
+        if (category == null)
+            return;
+
+        if (_model.CollaborationCategories.All(c => c.Id != category.Id))
+            _model.CollaborationCategories.Add(category);
+
+        _isPagePickerOpen = false;
+    }
+
+    private void RemoveCollaborationPage(Page page)
+        => _model.CollaborationCategories.RemoveAll(c => c.PageId == page.Id);
+
     private class EventEditModel
     {
         public DateTime? Start
@@ -235,6 +386,7 @@
 
         public DateTime? End { get; set; }
         public int? ParentId { get; set; }
+        public List<Category> CollaborationCategories { get; set; } = [];
         [Length(1, 100)] public string Title { get; set; } = "";
         [MaxLength(20000)] public string? DescriptionMarkdown { get; set; }
 
diff --git a/StartSch/Components/Pages/PagePage.razor b/StartSch/Components/Pages/PagePage.razor
index c1f3146e..02e9da50 100644
--- a/StartSch/Components/Pages/PagePage.razor
+++ b/StartSch/Components/Pages/PagePage.razor
@@ -28,7 +28,7 @@
                     <li class="label">
                         <md-icon>account_circle</md-icon>
                         <a href="https://pek.sch.bme.hu/groups/@_page.PekId">
-                            PéK 
+                            PéK
                             <span style="color: var(--md-sys-color-outline); font-weight: 400">/</span>
                             @(_page.PekName ?? _page.PekId.ToString())
                         </a>
diff --git a/StartSch/Components/Pages/PostEditPage.razor b/StartSch/Components/Pages/PostEditPage.razor
index d6f34697..bf552087 100644
--- a/StartSch/Components/Pages/PostEditPage.razor
+++ b/StartSch/Components/Pages/PostEditPage.razor
@@ -11,6 +11,7 @@
 @inject NavigationManager Nav
 @inject IServiceProvider ServiceProvider
 @inject AuthorizationService AuthorizationService
+@inject InterestService InterestService
 
 @if (!IsResourceAvailable(_post, AuthorizationService.CanEdit, out var unavailableStatus))
 {
@@ -56,6 +57,50 @@
                 </label>
             </div>
 
+            <div>
+                <div style="display: flex; gap: 16px; margin-top: 16px;">
+                    <div style="flex: 1;">
+                        <div class="small filled round">
+                            Kiválasztott kollaboráló körök
+                        </div>
+
+                        @if (GetSelectedCollaborationPages().Count > 0)
+                        {
+                            <div style="margin-top: 8px;">
+                                <md-chip-set aria-label="Kiválasztott kollaboráló körök" style="display: flex; flex-wrap: wrap; gap: 8px;">
+                                    @foreach (var collabPage in GetSelectedCollaborationPages())
+                                    {
+                                        <md-input-chip remove-only @onclick="() => RemoveCollaborationPage(collabPage)">
+                                            @if (RequiresCollaborationRequest(collabPage))
+                                            {
+                                                <md-icon slot="icon" title="Kollaborációs kérelmet igényel">pending</md-icon>
+                                            }
+                                            @collabPage.GetName()
+                                        </md-input-chip>
+                                    }
+                                </md-chip-set>
+                            </div>
+                        }
+
+                        <div style="margin-top: 12px; display: flex; gap: 8px; align-items: center;">
+                            <expressive-button type="button" class="small text round" @onclick="OpenPagePicker">
+                                <md-icon slot="icon">add</md-icon>
+                                Kör hozzáadása
+                            </expressive-button>
+                        </div>
+
+                        @if (GetPagesRequiringRequest().Count > 0)
+                        {
+                            <p class="small text" style="margin-top: 8px;">
+                                <md-icon style="vertical-align: middle;">pending</md-icon>
+                                Kollaborációs kérelmet igényel:
+                                @string.Join(", ", GetPagesRequiringRequest().Select(p => p.GetName()))
+                            </p>
+                        }
+                    </div>
+                </div>
+            </div>
+
             <div>
                 <label>
                     <span style="display: block">
@@ -96,7 +141,7 @@
                 else
                 {
                     <expressive-button @onclick="@(() => _action = PostAction.Save)" type="submit" disabled="@_isBusy"
-                                      class="small filled round">
+                                       class="small filled round">
                         <md-icon slot="icon">amend</md-icon>
                         Javítás közzététele (értesítés nélkül)
                     </expressive-button>
@@ -106,8 +151,8 @@
                 {
                     // I don't know why type="button" is needed here but not in EventEditPage and at this point I'm too afraid to ask
                     <expressive-button href="@($"/posts/{_post.Id}/delete")"
-                                    class="small text round error standard" type="button" disabled="@_isBusy"
-                                    style="margin-left: auto">
+                                       class="small text round error standard" type="button" disabled="@_isBusy"
+                                       style="margin-left: auto">
                         <md-icon slot="icon">delete</md-icon>
                         Törlés
                     </expressive-button>
@@ -115,7 +160,7 @@
             </div>
         </EditForm>
     </Form>
-    
+
     <Previews>
         @{
             _post.Title = _model.Title;
@@ -127,8 +172,51 @@
     </Previews>
 </AdminShell>
 
-@code {
+@if (_isPagePickerOpen)
+{
+    <md-dialog open @onclose="ClosePagePicker">
+        <h2 slot="headline" style="margin: 0; line-height: 1.35; padding-top: 8px; padding-left: 16px; padding-bottom: 4px;">
+            Kör hozzáadása
+        </h2>
+
+        <form slot="content" id="post-page-picker-form" method="dialog" style="margin: 0; padding-top: 4px;">
+            @if (GetAddablePages().Count == 0)
+            {
+                <p>Nincs több hozzáadható kör.</p>
+            }
+            else
+            {
+                <md-list style="max-width: 100%;">
+                    @foreach (var addablePage in GetAddablePages())
+                    {
+                        <md-list-item>
+                            <div slot="headline">@addablePage.GetName()</div>
+                            @if (RequiresCollaborationRequest(addablePage))
+                            {
+                                <div slot="supporting-text">Kollaborációs kérelmet igényel</div>
+                                <md-icon slot="start" title="Kollaborációs kérelmet igényel">pending</md-icon>
+                            }
+                            <md-text-button slot="end" @onclick="() => AddCollaborationPage(addablePage.Id)">
+                                Hozzáadás
+                            </md-text-button>
+                        </md-list-item>
+                    }
+                </md-list>
+            }
+
+            <p class="small text" style="margin-top: 12px;">
+                <md-icon style="vertical-align: middle;">pending</md-icon>
+                Az ikonnal jelölt körök hozzáadása kollaborációs kérelmet hoz létre.
+            </p>
+        </form>
+
+        <div slot="actions">
+            <md-text-button form="post-page-picker-form" @onclick="ClosePagePicker">Bezárás</md-text-button>
+        </div>
+    </md-dialog>
+}
 
+@code {
     // /posts/0/edit?categories=1,2&event=1
     // - new post, set initial relationships from queries
     // - groups are set from query // TODO: revisit PostEditPage
@@ -136,23 +224,14 @@
     // /posts/1/edit
     // - edit post
     // - groups must not change
-    //
-    // A post is owned by at least one group and can optionally belong to an event.
-    //
-    // A user must not be able to write a post in the name of a group they are not an admin of, unless the post
-    // belongs to an event with every group (signifying an agreement between the groups).
-    //
-    // Event can always be modified, but if it is set:
-    // - post.Groups must be a subset of event.Groups
-    // - user must be a part of at least one of post.Groups
-    //
-    // If the event is not set, the post must belong to a single group, which the user must be an admin of
 
     private readonly List<Event> _relevantEvents = [];
     private Post? _post;
     private PostAction _action = PostAction.Publish;
     private readonly NewPostModel _model = new();
     private bool _isBusy;
+    private bool _isPagePickerOpen;
+    private List<Page> _allPages = [];
 
     [Parameter] public int PostId { get; set; }
 
@@ -166,7 +245,14 @@
     {
         await using var db = await DbFactory.CreateDbContextAsync();
 
-        if (PostId == 0) // new post
+        await InterestService.LoadIndex;
+
+        _allPages = await db.Pages
+            .Include(p => p.Categories)
+            .OrderBy(p => p.Name ?? p.PekName ?? p.PincerName)
+            .ToListAsync();
+
+        if (PostId == 0)
         {
             Post post = new() { Created = new() };
 
@@ -174,12 +260,12 @@
                 return;
 
             List<int> categoryIds = CategoryIds.Split(',').Select(int.Parse).ToList();
-
             List<Category> categories = await db.Categories
                 .Include(c => c.Page)
                 .Where(c => categoryIds.Contains(c.Id))
                 .ToListAsync();
             post.Categories.AddRange(categories);
+            _model.CollaborationCategories = categories.ToList();
 
             if (EventId != null)
             {
@@ -196,7 +282,7 @@
             _model.EventId = EventId;
             _post = post;
         }
-        else // editing post
+        else
         {
             _post = await db.Posts
                 .Include(p => p.Categories)
@@ -205,30 +291,38 @@
                 .FirstOrDefaultAsync(p => p.Id == PostId);
             if (_post == null)
                 return;
+
             _model.Title = _post.Title;
             _model.ContentMarkdown = _post.ContentMarkdown;
             _model.ExcerptMarkdown = _post.ExcerptMarkdown;
             _model.EventId = _post.Event?.Id;
+            _model.CollaborationCategories = _post.Categories.ToList();
+
+            var requestedPageIds = await db.PostCollaborationRequests
+                .Where(r => r.PostId == _post.Id)
+                .Select(r => r.PageId)
+                .Distinct()
+                .ToListAsync();
+
+            var requestedCategories = await db.Categories
+                .Include(c => c.Page)
+                .Where(c => requestedPageIds.Contains(c.PageId) && c.Name == null)
+                .ToListAsync();
+
+            foreach (var category in requestedCategories)
+            {
+                if (_model.CollaborationCategories.All(c => c.Id != category.Id))
+                    _model.CollaborationCategories.Add(category);
+            }
         }
 
         if (_post.Event != null)
             _relevantEvents.Add(_post.Event);
 
-        // We need to find all events that the post can belong to (_relevantEvents), without updating categories
-        //
-        // SQL too hard, only allow updating event for posts owned by a single page
         List<Page> owners = _post.GetOwners();
         if (owners.Count != 1)
             return;
-        // Not supported by EF:
-        // _relevantEvents.AddRange((await _db.Events
-        //         .Include(e => e.Groups)
-        //         .Where(e => gs.All(g => e.Groups.Contains(g)))
-        //         .OrderByDescending(e => e.StartUtc)
-        //         .Take(30)
-        //         .ToListAsync())
-        //     .Where(e => e != _post.Event));
-        // If you smart, open a PR
+
         Page owner = owners[0];
         _relevantEvents.AddRange((await db.Events
                 .Include(e => e.Categories)
@@ -251,21 +345,60 @@
         Post post = await postService.Save(
             PostId,
             _model.EventId,
-            _post!.Categories.Select(c => c.Id).ToHashSet(),
+            _model.CollaborationCategories.Select(c => c.Id).ToHashSet(),
             _model.Title,
             _model.ContentMarkdown,
             _model.ExcerptMarkdown,
-            _action);
+            _action
+        );
 
         Nav.NavigateTo($"/posts/{post.Id}");
     }
 
+    private void OpenPagePicker() => _isPagePickerOpen = true;
+    private void ClosePagePicker() => _isPagePickerOpen = false;
+
+    private bool RequiresCollaborationRequest(Page page)
+        => !AuthorizationService.AdministeredPageIds.Contains(page.Id);
+
+    private List<Page> GetSelectedCollaborationPages()
+    {
+        var selectedPageIds = _model.CollaborationCategories.Select(c => c.PageId).ToHashSet();
+        return _allPages.Where(p => selectedPageIds.Contains(p.Id)).ToList();
+    }
+
+    private List<Page> GetPagesRequiringRequest()
+        => GetSelectedCollaborationPages().Where(RequiresCollaborationRequest).ToList();
+
+    private List<Page> GetAddablePages()
+    {
+        var selectedPageIds = _model.CollaborationCategories.Select(c => c.PageId).ToHashSet();
+        return _allPages.Where(p => !selectedPageIds.Contains(p.Id)).ToList();
+    }
+
+    private void AddCollaborationPage(int pageId)
+    {
+        var page = _allPages.FirstOrDefault(p => p.Id == pageId);
+        var category = page?.Categories.FirstOrDefault(c => c.Name == null) ?? page?.Categories.FirstOrDefault();
+        if (category == null)
+            return;
+
+        if (_model.CollaborationCategories.All(c => c.Id != category.Id))
+            _model.CollaborationCategories.Add(category);
+
+        _isPagePickerOpen = false;
+    }
+
+    private void RemoveCollaborationPage(Page page)
+        => _model.CollaborationCategories.RemoveAll(c => c.PageId == page.Id);
+
     private class NewPostModel
     {
         public int? EventId { get; set; }
         [Length(1, 100)] public string Title { get; set; } = "";
         [MaxLength(20000)] public string? ContentMarkdown { get; set; }
         [MaxLength(1000)] public string? ExcerptMarkdown { get; set; }
+        public List<Category> CollaborationCategories { get; set; } = [];
     }
 
 }
diff --git a/StartSch/Data/CollaborationRequest.cs b/StartSch/Data/CollaborationRequest.cs
new file mode 100644
index 00000000..744e2bb4
--- /dev/null
+++ b/StartSch/Data/CollaborationRequest.cs
@@ -0,0 +1,20 @@
+namespace StartSch.Data;
+
+public abstract class CollaborationRequest
+{
+    public int Id { get; set; }
+    public int PageId { get; set; }
+    public Page Page { get; set; } = null!;
+}
+
+public class EventCollaborationRequest : CollaborationRequest
+{
+    public int EventId { get; set; }
+    public Event Event { get; set; } = null!;
+}
+
+public class PostCollaborationRequest : CollaborationRequest
+{
+    public int PostId { get; set; }
+    public Post Post { get; set; } = null!;
+}
diff --git a/StartSch/Data/Db.cs b/StartSch/Data/Db.cs
index 93384a23..e8244e2a 100644
--- a/StartSch/Data/Db.cs
+++ b/StartSch/Data/Db.cs
@@ -15,10 +15,13 @@ public class Db(DbContextOptions options) : DbContext(options), IDataProtectionK
     public DbSet<Post> Posts => Set<Post>();
     public DbSet<PushSubscription> PushSubscriptions => Set<PushSubscription>();
     public DbSet<User> Users => Set<User>();
-
+    
     public DbSet<Interest> Interests => Set<Interest>();
     public DbSet<CategoryInterest> CategoryInterests => Set<CategoryInterest>();
     public DbSet<EventInterest> EventInterests => Set<EventInterest>();
+    public DbSet<CollaborationRequest> CollaborationRequests => Set<CollaborationRequest>();
+    public DbSet<EventCollaborationRequest> EventCollaborationRequests => Set<EventCollaborationRequest>();
+    public DbSet<PostCollaborationRequest> PostCollaborationRequests => Set<PostCollaborationRequest>();
     public DbSet<ShowEventsInCategory> ShowEventsInCategory => Set<ShowEventsInCategory>();
     public DbSet<ShowPostsForEvent> ShowPostsForEvent => Set<ShowPostsForEvent>();
     public DbSet<ShowPostsInCategory> ShowPostsInCategory => Set<ShowPostsInCategory>();
diff --git a/StartSch/Data/Migrations/Sqlite/SqliteDbModelSnapshot.cs b/StartSch/Data/Migrations/Sqlite/SqliteDbModelSnapshot.cs
index 6bd000e0..fca76402 100644
--- a/StartSch/Data/Migrations/Sqlite/SqliteDbModelSnapshot.cs
+++ b/StartSch/Data/Migrations/Sqlite/SqliteDbModelSnapshot.cs
@@ -106,6 +106,31 @@ protected override void BuildModel(ModelBuilder modelBuilder)
                     b.ToTable("CategoryIncludes");
                 });
 
+            modelBuilder.Entity("StartSch.Data.CollaborationRequest", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Discriminator")
+                        .IsRequired()
+                        .HasMaxLength(34)
+                        .HasColumnType("TEXT");
+
+                    b.Property<int>("PageId")
+                        .HasColumnType("INTEGER");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("PageId");
+
+                    b.ToTable("CollaborationRequests");
+
+                    b.HasDiscriminator().HasValue("CollaborationRequest");
+
+                    b.UseTphMappingStrategy();
+                });
+
             modelBuilder.Entity("StartSch.Data.EmailMessage", b =>
                 {
                     b.Property<int>("Id")
@@ -528,6 +553,30 @@ protected override void BuildModel(ModelBuilder modelBuilder)
                     b.HasDiscriminator().HasValue("SendPushNotification");
                 });
 
+            modelBuilder.Entity("StartSch.Data.EventCollaborationRequest", b =>
+                {
+                    b.HasBaseType("StartSch.Data.CollaborationRequest");
+
+                    b.Property<int>("EventId")
+                        .HasColumnType("INTEGER");
+
+                    b.HasIndex("EventId");
+
+                    b.HasDiscriminator().HasValue("EventCollaborationRequest");
+                });
+
+            modelBuilder.Entity("StartSch.Data.PostCollaborationRequest", b =>
+                {
+                    b.HasBaseType("StartSch.Data.CollaborationRequest");
+
+                    b.Property<int>("PostId")
+                        .HasColumnType("INTEGER");
+
+                    b.HasIndex("PostId");
+
+                    b.HasDiscriminator().HasValue("PostCollaborationRequest");
+                });
+
             modelBuilder.Entity("StartSch.Data.PincerOpening", b =>
                 {
                     b.HasBaseType("StartSch.Data.Event");
@@ -667,6 +716,17 @@ protected override void BuildModel(ModelBuilder modelBuilder)
                     b.Navigation("Includer");
                 });
 
+            modelBuilder.Entity("StartSch.Data.CollaborationRequest", b =>
+                {
+                    b.HasOne("StartSch.Data.Page", "Page")
+                        .WithMany()
+                        .HasForeignKey("PageId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Page");
+                });
+
             modelBuilder.Entity("StartSch.Data.Event", b =>
                 {
                     b.HasOne("StartSch.Data.Event", "Parent")
@@ -805,6 +865,28 @@ protected override void BuildModel(ModelBuilder modelBuilder)
                     b.Navigation("User");
                 });
 
+            modelBuilder.Entity("StartSch.Data.EventCollaborationRequest", b =>
+                {
+                    b.HasOne("StartSch.Data.Event", "Event")
+                        .WithMany()
+                        .HasForeignKey("EventId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Event");
+                });
+
+            modelBuilder.Entity("StartSch.Data.PostCollaborationRequest", b =>
+                {
+                    b.HasOne("StartSch.Data.Post", "Post")
+                        .WithMany()
+                        .HasForeignKey("PostId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Post");
+                });
+
             modelBuilder.Entity("StartSch.Data.CategoryInterest", b =>
                 {
                     b.HasOne("StartSch.Data.Category", "Category")
diff --git a/StartSch/Services/AuthorizationService.cs b/StartSch/Services/AuthorizationService.cs
index d2758872..256e1aac 100644
--- a/StartSch/Services/AuthorizationService.cs
+++ b/StartSch/Services/AuthorizationService.cs
@@ -96,6 +96,11 @@ public bool CanCreatePost(Page page)
     {
         return AdministeredPageIds.Contains(page.Id);
     }
+    
+    public bool CanAcceptCollaborationRequests(Page page)
+    {
+        return AdministeredPageIds.Contains(page.Id);
+    }
 
     public bool CanRead(Page page)
     {
diff --git a/StartSch/Services/EventService.cs b/StartSch/Services/EventService.cs
index d03ee898..92cc3ae5 100644
--- a/StartSch/Services/EventService.cs
+++ b/StartSch/Services/EventService.cs
@@ -18,32 +18,59 @@ public async Task<Event> Save(
         Instant? end)
     {
         Event @event;
+        var administeredPageIds = authorizationService.AdministeredPageIds;
+        var selectedCategories = await db.Categories
+            .Where(c => categoryIds.Contains(c.Id))
+            .ToListAsync();
 
         if (eventId == 0) // Create a new event
         {
+            var newParent = parentId.HasValue
+                ? await db.Events
+                    .Include(e => e.Categories)
+                    .Where(e => e.Id == parentId)
+                    .FirstAsync()
+                : null;
+
             @event = new()
             {
                 Title = title,
                 DescriptionMarkdown = descriptionMd,
                 Start = start,
                 End = end,
-                Parent = parentId.HasValue
-                    ? await db.Events
-                        .Include(e => e.Categories)
-                        .Where(e => e.Id == parentId)
-                        .FirstAsync()
-                    : null,
+                Parent = newParent,
             };
 
-            @event.Categories.AddRange(
-                await db.Categories
-                    .Where(c => categoryIds.Contains(c.Id))
-                    .ToListAsync()
-            );
+            var assignableCategories = selectedCategories
+                .Where(c => administeredPageIds.Contains(c.PageId)
+                            || (newParent != null && newParent.Categories.Any(pc => pc.Id == c.Id)))
+                .ToList();
 
+            @event.Categories.AddRange(assignableCategories);
             authorizationService.CheckCreate(@event);
 
             db.Events.Add(@event);
+
+            var possibleCollaborationRequestPageIds = selectedCategories
+                .Select(c => c.PageId)
+                .Except(assignableCategories.Select(c => c.PageId))
+                .Where(pageId => !administeredPageIds.Contains(pageId))
+                .Distinct()
+                .ToList();
+
+            if (possibleCollaborationRequestPageIds.Count > 0)
+            {
+                var collaborationRequests = possibleCollaborationRequestPageIds
+                    .Select(pageId => new EventCollaborationRequest
+                    {
+                        PageId = pageId,
+                        Event = @event,
+                        EventId = @event.Id
+                    })
+                    .ToList();
+
+                db.EventCollaborationRequests.AddRange(collaborationRequests);
+            }
         }
         else // Update existing event
         {
@@ -53,6 +80,8 @@ await db.Categories
                 .Include(e => e.Categories)
                 .FirstAsync(e => e.Id == eventId);
 
+            var existingCategoryIds = @event.Categories.Select(c => c.Id).ToHashSet();
+
             var newParent = parentId == null
                 ? null
                 : @event.Parent is { } parent && parent.Id == parentId
@@ -60,20 +89,49 @@ await db.Categories
                     : await db.Events
                         .Include(e => e.Categories)
                         .FirstAsync(e => e.Id == parentId);
-            var newCategories = await db.Categories
-                .Where(c => categoryIds.Contains(c.Id))
-                .ToListAsync();
 
-            authorizationService.CheckUpdate(@event, newParent, newCategories);
+            var assignableCategories = selectedCategories
+                .Where(c => administeredPageIds.Contains(c.PageId)
+                            || existingCategoryIds.Contains(c.Id)
+                            || (newParent != null && newParent.Categories.Any(pc => pc.Id == c.Id)))
+                .ToList();
+
+            authorizationService.CheckUpdate(@event, newParent, assignableCategories);
 
             @event.Parent = newParent;
             @event.Categories.Clear();
-            @event.Categories.AddRange(newCategories);
+            @event.Categories.AddRange(assignableCategories);
 
             @event.Start = start;
             @event.End = end;
             @event.Title = title;
             @event.DescriptionMarkdown = descriptionMd;
+
+            var existingCollaborationRequests = await db.EventCollaborationRequests
+                .Where(ecr => ecr.EventId == eventId)
+                .ToListAsync();
+            db.EventCollaborationRequests.RemoveRange(existingCollaborationRequests);
+
+            var possibleCollaborationRequestPageIds = selectedCategories
+                .Select(c => c.PageId)
+                .Except(assignableCategories.Select(c => c.PageId))
+                .Where(pageId => !administeredPageIds.Contains(pageId))
+                .Distinct()
+                .ToList();
+
+            if (possibleCollaborationRequestPageIds.Count > 0)
+            {
+                var collaborationRequests = possibleCollaborationRequestPageIds
+                    .Select(pageId => new EventCollaborationRequest
+                    {
+                        PageId = pageId,
+                        Event = @event,
+                        EventId = @event.Id
+                    })
+                    .ToList();
+
+                db.EventCollaborationRequests.AddRange(collaborationRequests);
+            }
         }
 
         await db.SaveChangesAsync();
diff --git a/StartSch/Services/FontCache.cs b/StartSch/Services/FontCache.cs
index 39d86dee..534f4343 100644
--- a/StartSch/Services/FontCache.cs
+++ b/StartSch/Services/FontCache.cs
@@ -42,6 +42,7 @@ public class FontCache
             IconNames =
             [
                 "account_circle",
+                "add",
                 "admin_panel_settings",
                 "amend",
                 "arrow_forward",
@@ -75,6 +76,7 @@ public class FontCache
                 "open_in_browser",
                 "open_in_full",
                 "open_in_new",
+                "pending",
                 "publish",
                 "restaurant",
                 "save",
diff --git a/StartSch/Services/PostService.cs b/StartSch/Services/PostService.cs
index bf06d901..d18356df 100644
--- a/StartSch/Services/PostService.cs
+++ b/StartSch/Services/PostService.cs
@@ -20,33 +20,60 @@ public async Task<Post> Save(
         PostAction action)
     {
         Post post;
+        var administeredPageIds = authorizationService.AdministeredPageIds;
+        var selectedCategories = await db.Categories
+            .Where(c => categoryIds.Contains(c.Id))
+            .ToListAsync();
 
-        if (postId == 0)
+        if (postId == 0) // Create a new post
         {
+            var newEvent = eventId.HasValue
+                ? await db.Events
+                    .Include(e => e.Categories)
+                    .FirstAsync(e => e.Id == eventId)
+                : null;
+
             post = new()
             {
                 Title = title,
                 ExcerptMarkdown = excerptMd,
                 ContentMarkdown = contentMd,
                 Created = SystemClock.Instance.GetCurrentInstant(),
-                Event = eventId.HasValue
-                    ? await db.Events
-                        .Include(e => e.Categories)
-                        .FirstAsync(e => e.Id == eventId)
-                    : null
+                Event = newEvent,
             };
 
-            post.Categories.AddRange(
-                await db.Categories
-                    .Where(c => categoryIds.Contains(c.Id))
-                    .ToListAsync()
-            );
+            var newCategories = selectedCategories
+                .Where(c => administeredPageIds.Contains(c.PageId)
+                            || (newEvent != null && newEvent.Categories.Any(ec => ec.Id == c.Id)))
+                .ToList();
 
+            post.Categories.AddRange(newCategories);
             authorizationService.CheckCreate(post);
 
             db.Posts.Add(post);
+
+            var possibleCollaborationRequestPageIds = selectedCategories
+                .Select(c => c.PageId)
+                .Except(newCategories.Select(c => c.PageId))
+                .Where(pageId => !administeredPageIds.Contains(pageId))
+                .Distinct()
+                .ToList();
+
+            if (possibleCollaborationRequestPageIds.Count > 0)
+            {
+                var collaborationRequests = possibleCollaborationRequestPageIds
+                    .Select(pageId => new PostCollaborationRequest
+                    {
+                        PageId = pageId,
+                        Post = post,
+                        PostId = post.Id,
+                    })
+                    .ToList();
+
+                db.PostCollaborationRequests.AddRange(collaborationRequests);
+            }
         }
-        else
+        else // Update existing post
         {
             post = await db.Posts
                 .Include(p => p.Categories)
@@ -54,6 +81,8 @@ await db.Categories
                 .ThenInclude(e => e!.Categories)
                 .FirstAsync(p => p.Id == postId);
 
+            var existingCategoryIds = post.Categories.Select(c => c.Id).ToHashSet();
+
             var newEvent = eventId == null
                 ? null
                 : post.Event is { } existingEvent && existingEvent.Id == eventId
@@ -61,9 +90,12 @@ await db.Categories
                     : await db.Events
                         .Include(e => e.Categories)
                         .FirstAsync(e => e.Id == eventId);
-            var newCategories = await db.Categories
-                .Where(c => categoryIds.Contains(c.Id))
-                .ToListAsync();
+
+            var newCategories = selectedCategories
+                .Where(c => administeredPageIds.Contains(c.PageId)
+                            || existingCategoryIds.Contains(c.Id)
+                            || (newEvent != null && newEvent.Categories.Any(ec => ec.Id == c.Id)))
+                .ToList();
 
             authorizationService.CheckUpdate(post, newEvent, newCategories);
 
@@ -74,6 +106,32 @@ await db.Categories
             post.Title = title;
             post.ExcerptMarkdown = excerptMd;
             post.ContentMarkdown = contentMd;
+
+            var existingCollaborationRequests = await db.PostCollaborationRequests
+                .Where(pcr => pcr.PostId == postId)
+                .ToListAsync();
+            db.PostCollaborationRequests.RemoveRange(existingCollaborationRequests);
+
+            var possibleCollaborationRequestPageIds = selectedCategories
+                .Select(c => c.PageId)
+                .Except(newCategories.Select(c => c.PageId))
+                .Where(pageId => !administeredPageIds.Contains(pageId))
+                .Distinct()
+                .ToList();
+
+            if (possibleCollaborationRequestPageIds.Count > 0)
+            {
+                var collaborationRequests = possibleCollaborationRequestPageIds
+                    .Select(pageId => new PostCollaborationRequest
+                    {
+                        PageId = pageId,
+                        Post = post,
+                        PostId = post.Id,
+                    })
+                    .ToList();
+
+                db.PostCollaborationRequests.AddRange(collaborationRequests);
+            }
         }
 
         if (action == PostAction.Publish)
@@ -81,7 +139,8 @@ await db.Categories
             if (post.Published.HasValue)
                 throw new InvalidOperationException("Post is already published.");
             post.Published = SystemClock.Instance.GetCurrentInstant();
-            db.CreatePostPublishedNotifications.Add(new() { Created = SystemClock.Instance.GetCurrentInstant(), Post = post });
+            db.CreatePostPublishedNotifications.Add(new()
+                { Created = SystemClock.Instance.GetCurrentInstant(), Post = post });
         }
 
         await db.SaveChangesAsync();
diff --git a/StartSch/Services/UserInfoService.cs b/StartSch/Services/UserInfoService.cs
index 51201496..e012320f 100644
--- a/StartSch/Services/UserInfoService.cs
+++ b/StartSch/Services/UserInfoService.cs
@@ -19,7 +19,6 @@ public async Task OnUserInformationReceived(UserInformationReceivedContext conte
 
         // Ensure we don't create the same Page twice
         await using var tx = await db.BeginTransaction(IsolationLevel.Serializable);
-        
         User user = await db.Users
                         .FirstOrDefaultAsync(u => u.AuthSchId == authSchId)
                     ?? db.Users.Add(new() { AuthSchId = authSchId }).Entity;
@@ -92,7 +91,6 @@ public async Task OnUserInformationReceived(UserInformationReceivedContext conte
         int updates = await db.SaveChangesAsync();
 
         await tx.CommitAsync();
-        
         if (updates > 0)
             cache.Remove(InterestService.CacheKey);
 
diff --git a/StartSch/appsettings.Development.json b/StartSch/appsettings.Development.json
index c7ae5353..eda68355 100644
--- a/StartSch/appsettings.Development.json
+++ b/StartSch/appsettings.Development.json
@@ -1,7 +1,9 @@
 {
+    "DetailedErrors": true,
     "Logging": {
         "LogLevel": {
-            "Default": "Information"
+            "Default": "Information",
+            "Microsoft.AspNetCore.SignalR": "Debug"
         }
     },
     "ConnectionStrings": {
diff --git a/StartSch/js/app.ts b/StartSch/js/app.ts
index e1b44a68..2e368bca 100644
--- a/StartSch/js/app.ts
+++ b/StartSch/js/app.ts
@@ -3,6 +3,13 @@ import "@material/web/button/filled-button.js";
 import "@material/web/button/filled-tonal-button.js";
 import "@material/web/button/outlined-button.js";
 import "@material/web/button/text-button.js";
+import "@material/web/chips/assist-chip.js";
+import "@material/web/chips/chip-set.js";
+import "@material/web/chips/input-chip.js";
+import "@material/web/list/list.js";
+import "@material/web/list/list-item.js";
+import "@material/web/divider/divider.js";
+import "@material/web/dialog/dialog.js";
 import "@material/web/icon/icon.js";
 import "@material/web/iconbutton/icon-button.js";
 import "@material/web/ripple/ripple.js";