welcome to the forum. while critical mass is insanely great, i also encourage you to visit
saltcycle.com, a non-profit organization set up with ride listings, vids, photos, etc.
also, if you are interested, we post upcoming bicycle events and you can receive event information in your email box:
http://www.feedburner.com/fb/a/emailverifySubmit?feedId=1660132&loc=en_US
drop a line if you have any questions.
cheers.
zed.