Phil, Phil, Phil,
You live in Chambersburg. That's the same climate as Gettysburg.
The honest chances are that there will be some "warm" weather in August.
After Charlotte 2009, I got myself some products like these from Cool Downz. A gel-bead filled bandana that after soaking in water, cools because of the evaporation.
https://www.youtube.com/watch?v=ofn5LZaJvYE
Get a couple...
Another thing is that the meet is held yards from the air-conditioned hotels, so it should be easy to duck inside for some relief.