When multiple team calendars are selected for display on a page, the calendar color is rendered by there isn't any identification of the calendar name or associated color. The only place you can see the association of calendar color and calendar name is on the Team Calendars page where you manage all the calendars in the Confluence instance.

It would be useful and nice to be able to display a legend as part of the calendar view (month, week, list)
RED - CONFERENCE ROOM A
BLUE - CONFERENCE ROOM B
GREEN - CONFERENCE ROOM C