I wish to have the option to indicate a calendar event with statuses such as:

"Cancelled"
"Postponed"
"Did not take place"
or similar. This is intended to keep the event logged in the calendar (as it's not deleted) with a corresponding label. Furthermore, the event should be categorised as a "past" event, ensuring that no notifications or concerns arise on the scheduled day.
A "postponed" event could also be linked to a future event to indicate it was postponed to XYZ. There, it would be easier to automatically clone the main event to date XYZ+3 giving the user to chance to add further details.