I live in Southern New Jersey. Some friends and I might be interested in playing with some other people or specifically joining in some store championships/ tournaments, but have no idea what places run them or how to find them. I know there is the regional up in NYC in June. Are there any other places running organized events for aGoT LCG in this area? Eastern PA, or NJ?

Regionals are fairly limited. There are only 2 per region and the north east got Maryland and NYC as their spots. You missed the Store Championship season by probably a few weeks unfortunately. You can add yourself to this map if you'd like (additions/simple marker or detailed if you want to add more info), but I don't see anything in southern Jersey really. Closest looks like Philly.