http://www.gunshows-usa.com/penn.shtml
You would look for any that are within 20 miles of Philly - really, what that leaves is the Philly National Guard bldg and Oakes - which is very large. For collectors, Allentown is the best in the region, but its about 70 miles or so from Eugenes.
I do have a range within about 4 miles of my house. Several places to rent like open covered place in a park and plenty of parking. About 2 miles from my house they do civil war reenacting every year " Pennypacker Mills " but they had this years already. That said, I have a decent deck on front of the house and a decent deck on the rear, but I am about 45 miles from Eugene's.