user's event save is fixed.

frontend/src/components/SchedulePage.jsx

@@ -555,7 +555,8 @@ function EventForm({ event, userGroups, eventTypes, selectedDate, onSave, onCanc
   const [desc,setDesc]=useState(event?.description||'');
   const [pub,setPub]=useState(event?!!event.is_public:!!isToolManager);
   const [track,setTrack]=useState(!!event?.track_availability);
-  const [grps,setGrps]=useState(new Set((event?.user_groups||[]).map(g=>g.id)));
+  const accessibleGroupIds = new Set(userGroups.map(g=>g.id));
+  const [grps,setGrps]=useState(new Set((event?.user_groups||[]).map(g=>g.id).filter(id=>isToolManager||accessibleGroupIds.has(id))));
   const [saving,setSaving]=useState(false);
   const [showTypeForm,setShowTypeForm]=useState(false);
   const [localTypes,setLocalTypes]=useState(eventTypes);