The 8th annual games will be Fri-Sun, Apr 15-17, 2011 in San Mateo, CA

RoboGames is the olympics of robots - we invite the best minds from around the world to compete in over 50 different events: combat robots, fire-fighters, LEGO bots, hockey bots, walking humanoids, soccer bots, sumo bots, and even androids that do kung-fu. Some robots are autonomous, some are remote controlled - but they're all cool! As an open event, anyone can compete - this means you.

http://robogames.net/