The location selection list or location filter will allow you to view events that occur at specific locations in the main calendar view. The filter will include events at mirror locations as well. Turn on the location filter via:

Go to Admin Menu > Calendar Options > Basic Tab > uncheck  "Hide location selection list
" > Save

Quick Tip:  A location must be added to the Saved Locations list in order for that location to appear in the Location Selection List in the main calendar. Add via Admin Menu > Locations