We have a black powder shoot the 2nd Sunday of the month. I think July is a woodswalk. Sheshequin Buckskinners. 7 miles north of Trout Run. We start at noon usually done in a couple hours.
We have a shoot the 2nd Sunday of every month. With a few exceptions. Not always a woodswalk. We may shoot paper targets or novelty targets. Even silhouettes sometimes.
PA has a group: PA Muzzleloading Assoc.; search it, check it out. Join fee is nominal for return. You get a members handbook that lists all member clubs in PA and they have a page listing dates and activities and a map in directions.
After thought here; The NMLRA has a list of state Associations & their contact info. Most state ML Assoc. have lists & info with contact info for clubs and relative associations in their states. These are a great starting points for your searches.
Here is a Link: https://www.pfbps.com/clubs/ (PA Federation of Blk Powder Shooters)