Its a pretty cool set up, people just get together and have an "unorganized" bike ride, just hitting the streets. No leader, no city permits, nothing official. Just throw up some fliers in advance and ride. You're not breaking any law, because it's not an official parade, just a group of people who "happen" to be riding together.
Like when a bunch of us mopeders roll down the street together.
But a critical mass in Cincinnati would be neat.