Is your question only for those in the Philly area?
I'm north of Boston in New Hampshire. We have one show that runs weekly and several others that go on throughout the year. If I had more time I'd go to one every weekend. Currently I'm lucky to make it out to 3 or 4 a year.
Also, not sure if it counts as a "show" but I also go to Cooperstown for induction weekend most years. Tons of card vendors there. I used to be hesitant to look at cards because I didn't want to lug my heavy binder of checklists around and I worry about buying duplicates but since I've found this site, I have my checklists at my fingertips through my phone. Total game changer!