diff --git a/backend/caldav_client.py b/backend/caldav_client.py
index 23c9bdd..49f9ca6 100644
--- a/backend/caldav_client.py
+++ b/backend/caldav_client.py
@@ -211,7 +211,8 @@ def update_event(
     url: str, username: str, password: str, event_url: str, data: Dict
 ):
     client = _client(url, username, password)
-    resource = client.event(url=event_url)
+    resource = caldav.Event(client=client, url=event_url)
+    resource.load()
     raw = resource.data
 
     cal = Calendar.from_ical(raw)
@@ -255,7 +256,7 @@ def update_event(
 
 def delete_event(url: str, username: str, password: str, event_url: str):
     client = _client(url, username, password)
-    resource = client.event(url=event_url)
+    resource = caldav.Event(client=client, url=event_url)
     resource.delete()
 
 
diff --git a/frontend/js/calendar.js b/frontend/js/calendar.js
index 8e2ae6a..bfa22a3 100644
--- a/frontend/js/calendar.js
+++ b/frontend/js/calendar.js
@@ -723,6 +723,7 @@ function bindSidebar() {
 // ── Event Popup ───────────────────────────────────────────
 function showEventPopup(ev, anchor) {
   const popup = document.getElementById('popup-event');
+  document.getElementById('popup-copy-menu').classList.add('hidden');
   popup.classList.remove('hidden');
 
   const color = ev.color || ev.calendarColor || '#4285f4';
@@ -1935,7 +1936,11 @@ function buildWritableCalendars(_excludeEv) {
 }
 
 async function copyEventToCalendar(ev, cal) {
-  const { title, start, end, allDay, location, description, color } = ev;
+  const { title, allDay, location, description, color } = ev;
+  // Normalize to UTC ISO string so the backend doesn't misinterpret bare local times
+  const toISO = s => (s && s.length > 10) ? new Date(s).toISOString() : s;
+  const start = allDay ? ev.start : toISO(ev.start);
+  const end   = allDay ? ev.end   : toISO(ev.end);
   try {
     if (cal.type === 'google') {
       await api.post('/google/events', {