My son is nearly 11, 5-th grader, and we are in Needham, not too far away. We usually fly at a large city park nearby which is *almost* big enough to contain all our rockets if it isn't too windy.
Our launch days (and attendance at CMASS) are usually limited by my work schedule, and I know my son (and a few of his friends who also fly) would always like to meet others to coordinate launches and talk rocketry.
Feel free to send me contact info here or by email if you'd like to try to meet:
john.f.sullivan AT gmail.com
