I dunno, Jason is kinda right as far as SF goes; it obviously depends on the act and the resulting demographic of the crowd, but generally (especially as far as Ozma is concerned) LA-area shows tend to be a bit rougher and more mosh-inclined, unfortunately. Over the five years I've seen them it's definitely gotten better, probably as the fanbase has grown up and cut that shit out more and more, but there's a definite north/south divide there.
Anyway, common sense should tell you this: don't do shit that grossly interferes with other people's ability to enjoy the show. I don't know what more to say.