For anyone in the Virginia area May 30 or 31, Troop 39 and WamaLTC are hosting the third annual Scouting for Bricks event.
From their website:
Come see amazing LEGO displays of castles, civil war scenes, Star Wars battles and hundreds of other creations by Fans of LEGO. We will also have LEGO Trains, Mindstorms robots, over a dozen specialized LEGO traders, and custom minifigures galore. Enjoy our hands-on family play area with over 100,000 LEGO bricks and DUPLO blocks.
Sounds like a good time and helps fund camping trips and equipment for these kids.