Meet up, chat, have a few drinks and maybe get some swarm badges (for the newbies!)
Note from team foursquare:
Our very own Dennis Crowley and Holger Luedorf will be in London on Thursday, May 26th and would love to meet foursquare users in the area! If you know a good venue for a casual meetup or happy hour beginning at 6pm, please suggest it above. Make sure to tell your friends about it and tweet @dens and @holger!