[CalendarServer-users] Is it possible to set up a group calendar in DCS that contains calendars from Basecamp?

Hi, My company has around 30 projects in Basecamp. We are using Calendar Server as our company calendar server so that we can collaboratively edit our calendars. We would like to subscribe to each of our Basecamp projects (separately not the global feed) so that we can do one-to-one comparisons, color each project differently, etc. We don't want each of our workers to have to manually subscribe to each of our 30 calendars in their own calendar clients. Is there a way to create a calendar group in Calendar Server, add each worker as a member, and subscribe the group to each of our Basecamp projects? That way the Calendar Server could serve up all of the calendars. Is this possible? Thanks, Michelle