When an appointment or event is cancelled or rescheduled I often need a record of the originally scheduled day and time.

At minimum I would like the ability to add strikethrough text to the event title, so that I know that the event was cancelled.

Ideally I would like a cancel button (next to the delete and edit buttons) that strikes the event title and turns off notifications, and asks if I would like to reschedule. If I reschedule, it will duplicate the original event and allow me to set a new date (and modify the other settings, if needed). This would leave the original event struck through without notifications and adds a new event at a new date and time.

Of course the implementation can vary, especially if you want to expand this for events with other participants.

Note: I primarily use the Android app so if this is available elsewhere please bring it to Android.