[feature request] add option to hide certain calendars based on time period

[svalo]

Use case: I do have both personal and work calendar synced on my phone and I have the widget on my home screen. During non working hour and weekends, when I unlock the screen, I see work-related appointments bringing my mind back to work.

I would like to have an option which allows me to hide work-related calendars/tasks during weekends and free time. In some ways it's similar to android's "quiet hours" and if easier to implement the timeframe can be taken from there.