Davey, when you say given the basic guidlines, do you mean that you go as far as actually telling them?Personaly, I would think that a bit over the top. I have always felt that somebody new should try to get the feel for (or the "rules" of) a musical event. If I go to somewhere new to me, I try hard to undertand the way it works and to follow the way the regulars go about it - I think that is jut another part of common courtesy.
Please don't get me wrong, I do make "mitakes" and have needed to be told on a couple of occassions but overall, I have found that it works.
Jon