feat: use the new, revised database model

WebApp/Views/Events/Create.cshtml

@@ -26,6 +26,11 @@
         <input asp-for="EventDate" type="datetime-local" class="form-control" />
         <span asp-validation-for="EventDate" class="text-danger"></span>
     </div>
+    <div class="form-group">
+        <label asp-for="OrganisationId">OrganisationId (for debugging purposes)</label>
+        <input asp-for="OrganisationId" class="form-control" />
+        <span asp-validation-for="OrganisationId" class="text-danger"></span>
+    </div>
     <button type="submit" class="btn btn-primary">Save</button>
 </form>