Here's an event that I have been meaning to attend. I have never been to this one, and it's not too far from my house so I think I might give it a try. It's a Lego event, but in this case it's more targeted to the Robotics people (Hooray!!!). It's scheduled for Saturday, March 19, 2011 from 11:00 am to 6:00 pm in Ann Arbor, Michigan at the Morris Lawrence Building on the campus of Washtenaw Community College.
Here's a link to the event. They also have a Facebook Event page, and from the looks of it, it might be a pretty big event. There are even a few names on the site that I recognize.