Hey there, found this thread online and thought I'd add some info. I'm with the Eclipse Base Ball Club of Elkton based in Elkton, MD. We play by 1864 rules in the Mid Atlantic Vintage Base Ball Association.
http://www.elktonbbc.com
To Jay Wolt, we host the Gettysburg Festival and yes its a great time, thanks for the good words about it. This year will be the 5th time we hold the event. Draw teams as far as Texas and its a ton of fun. Hope we could meet up at some point if you come again.
If I can be of any help to people looking to play in the PA, MD, NJ, NY area, I can try to send you in the right direction. The TN gents have a great program and are easily found online.
Huzzah!