*Is your feature request related to a problem? Please describe.
I want to do some kind of shift plan with polls. For that, it would be cool, to have an option to show only the dates in the future.

Describe the solution you'd like
In the frontend: hide past events
In the backend: hide past events for all user
Best would be, if you could choose between hiding by default (option to show all dates) and hiding for all frontend users (no option to show all dates).