I saw a FB posting about the Columbus ride. They claim to have had 1,000 people last year. I just might join them since Chicago is the next closest ride and its a GOOD drive.
The party after the ride should be the most fun. And YES they are watching over the entry to keep people out who did not participate in the ride.
On bikeforums.net somebody posted asking what would be the right vintage bike to ride in the event in Portland.
-r