as you can see from the attached image I’ve 2 users X, and Z.
Those users are in a group named ‘foobar’ with a role assigned as explained in the picture. X can’t see the meetings inserted by Z and vice versa when I set ‘group’ to edit or delete action.
The Calendar module has some unique ways of grabbing all of the meetings, etc which is causing them not to show. I believe in your case it may be as simple as editing /modules/Calendar/CalendarActivity.php and changing anything that looks like: