I will talk to my friends in Van when I get a chance, but in the meantime, you can check with these two bike shops that we've dealt with. I know John Henry has organized rides, and I'd be surprised if Dizzy doesn't...

http://www.johnhenrybikes.com/pedals.asp
http://www.dizzycycles.com/

If there's nothing about rides on the web sites, send them an email. Hopefully, someone will get back to you pretty quick!

Namaste,
~T~