In Japan, you have no idea what they are saying, and they can't help you either. Nothing makes any sense. They're very polite, but you feel like a joke is being played on you the entire time you're there.
Parties are only bad when a fight breaks out, when men fight over women or vice versa. Someone takes a fall, an ambulance comes, and the police arrive. If you can avoid those things, pretty much all behaviour is acceptable.
I throw a Christmas party at my house. It's not really a Christmas party, because I don't want to call it a Christmas party. But let's just say I put a lot of Christmas trees around the house, so it smells good.
I go home and stay there. I wash and scrub up each day, and that's it. One month I actually grew a moustache, just so I could say that I'd done something.