Four Quarters Interfaith Sanctuary located in southern Pennsylvania, provides a number of festivals and open circles for pagans to join.
I’ve visited their Sanctuary before, and although it’s a bit a long drive for me, I highly recommend to check it out. Lots of friendly people camp there, but at certain times of the year, the place embraces the celebration of Sabbats, drums, dance, and other fun.
They also make some wonderful mead. Check em out.