A lot of questions lol. Yes clubs are different than others. As for etiquette its not like going to church or something. Basically the soldiers/associatesof certain crews hold base there. Of course other crews in that or other families can come for sitdowns and whatnot. for example in July of 1979 the bonanno capos went to the ravenite(Gambino social club) after Carmine Galante was killed. Sometimes they have someone who watches the club all the time. Fat Tony Salero had his club guarded 24 hours a day.