How to do it
Open the event details.
Choose Cancel event.
Add a reason if needed.
Confirm the cancellation.
Overview
Mark an event as cancelled in the calendar and inform participants without deleting it immediately.

Events and calendar
Mark an event as cancelled in the calendar and inform participants without deleting it immediately.
Open the event details.
Choose Cancel event.
Add a reason if needed.
Confirm the cancellation.
Mark an event as cancelled in the calendar and inform participants without deleting it immediately.
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