Not to be a complete hometown guy...but I think Pittsburgh would be a optimal spot for such a gathering. Not just because I live here but for several reasons.
First, Pittsburgh is pretty centrally located to the states you had mentioned, WV, OH, VA, NY, DE and MD.
Secondly, PA is an open carry state and Pittsburgh doesnt have need for a permit to OC like Philadelphia. MD and NY are out, andWV and DE don't have full statepreemption. Now, while PA may not be a gold star state like VA, perhaps that fact would help us drum up some more press. Especially for our norther friends who like to think that armed citizens are relegated to the south and west.
Thirdly, Pittsburgh is a pretty nice city and there is actually a great many things to do here so it would be a nice vacation for those willing to make the travel.
Lastly, did I mention I live here? Why is that important? Well, once you meet me you'll find out! :celebrate