Brickworld is this weekend in Wheeling, IL (a suburb of Chicago). I will be attending and will do a write up with pictures next week. [Updated 06/24/2008: Just posted Brickworld 2008 Review (with pictures)]
This will be the first national LEGO event I have ever visited. This year I will be visiting the public exhibition only, since I will have my whole family along. In the future, I may attend as a registered participant, which includes classes, building sessions, and many other activities.