What goes on at these places?

Anyone ever been to a swing club? I’m dreadfully curious—what’s it like? What are the rules, the etiquette? Can you go and just watch or do they find that annoying?

By “swing clubs” I mean the type of establishment where you have a membership and there are scheduled parties and dances, rules and regulations, etc. Off premises or on. It turns out there’s such a club in the city where I live, and I’m told by my gentleman friend that an acquaintance of his (from work no less) can refer us to the proprietors. I’m not the type to want to get naked with strangers, but I certainly am the type who has always wanted to indulge an untried voyeuristic inclination.

So, the more anyone can tell me about what goes on at these parties, the better. I’ll know if I want to try and go to one…or two or three or…