Recordings made in events in calendar view are saved to the Event history. If you edit the event, you can see from the event history what was the original recording.
Clicking the View button, at the beginning of the Event history row, will open the event with the data in that history time.
If event is deleted, it won't show in event history.
Click the event in the calendar and menu with different options will open. Click Event history.

Window will open and shows when event is created and when it has been modified. Approving the event or event projects creates own record and in Is approved field shows lock icon. Created/modified time is set to be the time of the approval.
Window will open and shows when event is created and when it has been modified. Approving the event or event projects creates own record and in Is approved field shows lock icon. Created/modified time is set to be the time of the approval.
Clicking the View button, at the beginning of the Event history row, will open the event with the data in that history time.