Tojo, it's in the middle of September. The museum can be seen from the turnpike as you get to the Carlisle exit. There's tanks and artilery on an outside trail too (if the weather is nice). I'll let you know as soon as I can get the date. It wasn't posted on the website yet. The contest is inside the museum and is free to entrants of the contest. It's great because after you get your entries set up on the tables and check out the vendors, you can roam around the museum for a while. They have a restaurant there too with GOOD FOOD.
Jim