DUXBURY, Mass — It’s believed to be a first of it’s kind concept on the South Shore. A unique club just for girls with intellectual and developmental disabilities - that is free and open to all. One Friday night a month, St. John’s Church in Duxbury is full of music and laughter. Teenage girls dancing may not seem like anything out of the ordinary, but for the girls in this room, it is a rare chance to make friends in a safe space and feel included. No boys allowed. No inhibitions.