This is what I'm trying to find out, Rob. I have no problems with the summer. Gettysburg is only about a 2 hour drive for me, so even if people want to come for a longer stay and I can only do a couple days it's no big deal for me. The price difference really isn't that significant - maybe 10 bucks or so a day. I am looking into the Drummer Boy campground as a possible location. If anybody has any problems with this one, let me know. Summer time would probably be better for kids who would like to swim - they have 2 pools, one with a slide.
http://www.drummerboycampresort.com/index.php?pr=Home
I don't want to promise anything I can't deliver on, but I also have a friend who is a licensed guide for the battlefield and I may be able to swing some special rate or something there. He only does it part time, so it may not be a happening thing, but as time goes on if this looks like it's going to happen, I can check with him.