Ok, we can coordinate two ways: meet at teh start and start out together, with early finishers agreeing to wait, then we either crash in somebody's van, or go to a place with A/C together. Or, we set a time and place to meet off-the-fairgounds site after the finish.

Or as Freedomrider suggested, just hang around at the finish until all have come in, and have a chat and make a plan. You're all headed home Saturday afternoon, so it isn't feasible to have you over to my house, since I live 25 or so miles away from the start/finish, in Ann Arbor.