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.