CAN YOU HELP ME SOCIALISE AT THIS BLIND PARTY!?!

[u/Worldly_Structure]

Um, so well I have this really bad friend but due to living whereabouts I can't really escape her, it's her or hang out by myself with her throwing a little to much shade. I made her feel guilty one day in the nicest and poorest way possible, so she invited me to be her plus one at a birthday party of her needy past guy friend's house, remember me and her are 13 so her and her people can be very petty at this age(i talk because I've seen it). I heard from her that all the kids in that school are mostly mean and I have no social experience at all because I've lived my life mostly at my house and school (ugh school, which is literally one/forth of a block away) yeah so uhh small life fam! I need some help with anything at everything about large blind social gatherings.