How should I act at my boyfriend's house party?

liberty994
I've been dating my boyfriend for a couple of months now, and although he's introduced me to his family and a couple of his closest friends, I've yet to meet his wider social group. This weekend he's having a house party, and it will be the first time I'm introduced to them. I know it sounds a stupid question, but how should I act around them? It's really important to me that I "get their approval", so does anyone have advice (what to wear, how much to drink, how much time to spend with him, whether to ask if I can bring a friend with me etc). I don't want to embarrass him!

For context, he's 23 and I'm 18 - the age gap isn't a problem for us, but when I met his best friends I felt really young (I'm still at college whereas they're all working full-time and starting to settle into proper adult life), and I know he gets a bit of stick for dating a teenager. I'm also a lot quieter than he his, a bit of a geek really, and he tells me that he's one of the calmer ones in his group.
How should I act at my boyfriend's house party?
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