Option to individually hide events in Calendar and Timeline

Especially teacher's and other staff's calendars are often cluttered by events of no real concern to them, for instance activities / due dates managed by other teachers/staff.
It would make it easier for them with a "Hide this in my Calendar / Timeline" option for each event.
It should combined with a "View my hidden events" option, and the option to show selected events in the Calendar and the Timeline again.