How do I remove a member from a calendar or group?

In OurCal you can't remove a member from individual calendars but only from the whole group.

From OurCal's Groups tab:

1. Tap the group
2. Tap the info button in the top right
3. Tap the member you wish to remove
4. Tap Remove Member

This will result in the member being removed from the group and them being unscheduled from all of its events.