Any burg can have a tree lighting ceremony or singalong Handel during the holidays. In San Francisco you can round up your grandkids and take them to a Dance-along Nutcracker. The Geezer advises a matinee not only for the discounts but because kids are not allowed at evening performances. After all this massively entertaining event is produced by number of gay organizations and the spirit is on a sliding scale from riotous to raunchy. Yerba Buena Center for the Arts. Kids and seniors $16.