the first annual Rubber Tramp Rendezvous has been set for this coming january near Quartzsite, Arizona. there have been alot of gatherings of vandwellers of different sizes and in different places around the country, but this will be slightly more structured (as much as you can structure a bunch of nomads) and hopefully a larger gathering than any before.
January 13- 23, 2011
on BLM desert land near Quartzsite Arizona
you can read more about it here, at Bob Well's site: