Well, you're in an excellent place, geographically, if accomplish fencers are those who's souls you wish to capture with your shutter

A large portion of the olympians for this year train at the fencers club in new york, and include keeth smar(sabre), ivan lee(sabre), erinn smart(foil), tim morehouse(sabre, team alternate), kamara james(epee) and probably a few I'm forgetting.
Jan viviani(alternate, epee) trains at the new york athletic club(I think). Even if you aren't looking specifically for olympians, you can certainly find elite-level fencers in new york. You might want to contact the fencers club to see if you can arrange a visit.
As for fencing in the philly area...I know it exists, but I'm not quite up on it. I know several people here can inform you better than I.
p.s. again due to your location, you're in the perfect position to re-introduce yourself to the sport personally. I say get to it, you know you'll be glad you did.