Combining Calendars in iCal
This is really quite simple, but not simple in the usual Apple fashion.
- Create a new calendar group.
- Drag the calendars you want to combine into the group.
- Select the group, and then export it via
File->Export
- Import the the file you just created into a new calendar.
- Delete the calendar group after being happy that everything is present (which it should be).
That's all there is to it.