There have been a few scattered local events in the Lancaster and Harrisburg areas over the past couple of years, but no regularly meeting established groups that I'm aware of. There used to be a regular group meeting in the KoP area a couple of decades back, but long gone. Then there are the 3 annual Historicon game conventions, one of which is traditionally held in the Lancaster, PA area and another which occasionally ends up at Valley Forge or other venues, and there's typically been a room dedicated to BattleTech events.