How do you access all CalDAV calendars / events on OSX?

Question

I want to access all the calendars that a user can see in iCal on OS X. I know about EventKit and CalendarStore. However, it seems that both of these frames skip the calendars of CalDAV delegates (which are visible in iCal). Others also noticed this:

http://openradar.appspot.com/7077307

Google Delegates Calendar Schedule / EventKit

So, if EventKit and CalendarStore do not, how to do it?