To be honest, I don't think there is a lot of difference between a club and a house party.
Now... before people jump up and down and start pointing out the obvious differences like a club may have a bar, or at least a BYOB arrangement etc, I'm well aware, we've been to several clubs, and quite a number of parties lol!
What I'm talking about is the "etiquette" of swinging... those "rules" that we all abide by.
No means no, wherever you are.
Drugs, drunkenness, and loutish behaviour are not tolerated etc, and gents... wiping your cock in the curtains is a definite social faux-pas lol!
Sure, the ambience will be different at a house party, it does feel more intimate, and clubs can, in parts, feel a little "seedy" or "naughty" (which is part of the fun). I can still remember the first house party we went to, the hostess gave us a quick tour of their "2 up 2 down", and we joined the 10 or so guests downstairs... drinking tea and coffee... and it had a surreal feel to it, a suburban tea-party where the subject up for discussion was sex lol. But, once the nerves had subsided, and the ladies had changed into outfits definitely NOT found in your usual tea-party, we were away.
Clubs are a little more "forward", once you get into the bar/social area there is usually more flesh on show more quickly, but, just like a house party, people tend to wander off to have fun elsewhere, and the atmosphere can feel a little more sexually charged, but people still sit around drinking tea and coffee and talk about sex lol.
In both, some just chat, some wander around watching others, some disappear into private rooms to do their "thang" unmolested, and some do it with gay abandon where ever and with whoever they feel the urge.
Bottom line, just do your thing, don't feel pressured to join in, and enjoy yourselves.