There was an atheist picnic at the park where I work. They were celebrating the rapture that was supposed to take place back in May (needless to say, they weren't too surprised when the rapture was called off). I got to speak with a few people, but most of the meetup groups were rather far for me to drive to on a regular basis.
Thanks for the links. I'm located in the DFW metroplex, but I could make a drive to a meetup elsewhere once in a while.