Admin Dashboard showing Calendar Creator, Subscribers and other admin info

As an.... administrator or Team Calendars

We would like.... a page / global admin panel or table somewhere showing a list of all calendars in our instance. We would also really like to see a list of who created each calendar, how many subscribers each calendar has, a list of calendars containing no events, calendar age and possibly how many events each calendar has.

In order to..... make the team calendar administration process easier. We would like to be able to delete old / duplicate calendars easily, track calendar usage and view areas that we can get business team to improve on and be able to contact calendar creators / change calendar ownership should users leave the organisation.