Business calendar improvements for a global company

The Business calendar feature needs to be updated/developed in order to be useful for a global company like ours.

Example: North America region wants to add their bank holidays etc to the calendar visible only to that region. Adding the dates now gets visible also for other regions not interested in seeing NA holidays, this clutters the calendar,

Users have a need and a work around they use is to create a container campaign where they add their specific region bank holidays, which enable them to filter the calendar.

So, a need is to be able to add region specific business calendars, be able to toggle on/off in the calendar view, and filter