Give the ability to track where a calendar event originated from.
Scenario: Someone shares a calendar event with you to put on your calendar. You accept the calendar event. 3 weeks later you notice the calendar event is incorrect, but you can't change the event because it's locked for edits. The other user created the event and they are the owner, so no luck in editing the event.
I suggest you put a tooltip, or something of that nature, when you hover over that shared calendar event that appears on your calendar while you're in Site Manager. This will allow you to contact the originator of the event and have them edit the event.
Sorry, that's the best I could do explaining it.