Remove some more fields for copy event action.

dav_events/views/events.py

@@ -306,10 +306,12 @@ class EventCreateView(EventPermissionMixin, generic.FormView):
             if not self.has_permission('view', event):
                 raise PermissionDenied('copy')
 
-            for field in ('id', 'owner', 'created_at',
+            for field in ('id',
+                          'owner', 'created_at',
                           'accepted_at', 'accepted_by',
                           'publication_confirmed_at', 'publication_confirmed_by',
-                          'number'):
+                          'number',
+                          'planned_publication_date', 'internal_note',):
                 setattr(event, field, None)
             for field in ('accepted', 'publication_confirmed'):
                 setattr(event, field, False)