San Gabriel Mission Playhouse is a 1400 seat historic theater, minutes from Downtown LA - performances include classical ballet, Mexican folk dance, Chinese opera & dance, classical & jazz music, mariachi, musical theatre & film, private events welcome. San Gabriel Mission Playhouse is a 1400 seat historic theater available for hire in San Gabriel, California, just minutes from downtown LA. Performances include classical ballet and Mexican Folk Dance, Chinese opera and dance, classical music, jazz music, Mariachi, Musical Theatre and film.