Boo Bash at the YMCA at O.P. Schnabel Park is a spooky community party in San Antonio for ghosts, goblins and the whole family. It's free, and the event is built around a safe, fun night of trunk-themed trick-or-treating. The park's outdoor setting makes it a relaxed Halloween scene where kids can dress up and enjoy the festive atmosphere with their crew. Bring the costumes, bring the little ones and enjoy a ghoulishly good time with your neighbors.