Option to display events calendar in subcategories

It could be very useful to have an option to show the events from a calendar subscrtiption by category level in all their subcategories.

We have a category tree by Faculty and as university we have a global calendar (all users can see this calendar as a site calendar subscription) but we also have a specific Faculty calendars. If we want to show the Faculty calendar in all courses of the faculty we have to create a subscrition for each subcategory with the same calendar.

For example, the Faculty of education has 7 degreees that share the same academic calendar. If we want the students of the faculty could see all the faculty events, we have to create one subscription for degree.

Our tree course categories is similar to:

• Faculty 1
  • Degree 1
    •  Academic year 1
    •  Academic year 2
    •  ...
    • Academic year 5
  • Degree 2
    • Academic year 1
    • Academic year 2
    • ...
    • Academic year 5
  • Degree N
    • Academic year 1
    • Academic year 2
    • ...
    • Academic year 5
• Faculty 2
  • Degree 1
    • Academic year 1
    • Academic year 2
    • ...
    • Academic year 5
  • Degree 2
    • Academic year 1
    • Academic year 2
    • ...
    • Academic year 5
  • Degree N
    • Academic year 1
    • Academic year 2
    • ....
    • Academic year 5