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RoboGames describes themselves as "the world's largest open robot competition". They have over 70 different events, including some specifically for LEGO.
RoboGames 2007
Date: Fri-Sun, Jun 15-17, 2007 (LEGO events on Saturday)
Time: Noon - 10pm
Where: San Francisco, Ft. Mason Center, Festival Pavilion
More details here.