SWAMP Club has a Meetup page
with a more structured event notice and RSVP system.http://www.meetup.com/swampclub
Membership is currently free and sponsored by the SWAMP Mountain Bike Club.*
This (optional) site has additional features that allow for more focused discussions and an easy RSVP system for SWAMP events.
See you on the trails!* Some Meetup sites charge for page membership