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Specifically, if there are any children, pets, or elderly relatives in the vicinity, go out of your way to make sure they're engaged and having a good time and not just hanging out forgotten in a corner, as so often happens at family parties. You'll look like a mensch, and besides, they're probably easier to talk to than probing adults. I mean, hopefully this is a thing that occurs to you to do anyway (you're not a jerk, are you?), but if you can be seen doing it by a group of people who are trying to assess your character, all the better.