Open Gym Sponsored by Princeton Youth Basketball Association Looking for something to do on non-school days? Come join us for open gym at the High School! PYBA staff will supervise each session. Children 9 years old and younger must be accompanied by an adult. Some school equipment will be available for use, but we encourage you to bring your own. Note: You must register online to agree to the waiver form. Pay online during registration. We encourage online enrollments; if there are no enrollments online for any given open gym day, we may automatically cancel that session.