I think ad hoc meetups like this are fantastic, they are future of community organizing. Nan Arthur of Whole Dog Training in San Diego wrote to tell us about DogBeGood : San Diego Dog Behavior Support Group which will be having a "live" gathering in the San Diego area on November 13. If you're in the area, check them out!
In broader news, though, MeetUp.com has a clicker training section for people who want to find and meet with positive trainers in their area. If you're living in an area where you can't find like-minded trainers, try a MeetUp.com! This is the site made famous by Howard Dean's come-from-nowhere campaign, and it can work for trainers, too!