A bit closer than the Beantown competition (by about an hour), would be BattleCry@WPI, hosted by Team 190 in Worcester, Mass. In it's 4th annual running, it's known to many teams as one of the best competitions run each year.
More information can be found at
http://www.wpi.edu/+battlecry I don't think the new website for BC4 is up yet, but it should be quite soon.