I just signed up for the Western Express Rally in September-- looks like it'll be a good time, and everyone I've corresponded to seems to have really enjoyed it.
And, since it starts in Denver, that makes it pretty attractive.
Anyhow, if anyone's interested, here's the link.....
http://www.expressrally.com/#/western-express-21/
Might be kind of fun to get some M2's along for the ride.