You really want to get in touch with Tin Can Tourists. We are going to be a part of such a display this weekend. Our coach is not Concourse type, as the sign I hang out says... "Forty years old and still in regular use. We don't plan to "restore" it, we are trying to wear it out before we do."
Get on their site and look for a gathering near you. They happen all the time. There are actually six in the next three weekends - all largely separated geographically, but all the same in spirit.
Matt