Drupal camps
Tomorrow is DrupalCamp Paris and 60 people signed up. Next week is DrupalCamp New York and 60 people signed up already. Two of my favorite cities in the world. Insane!
(Like a BarCamp, a DrupalCamp is an ad-hoc un-conference driven by its attendees. It is free and open for everyone but it has no visitors, only participants.)
— Dries Buytaert