Biggg ass party i’m invited 2 but i don’t know anyone/they all know eachother ..

So, i left school over a month ago now and ill retake in September, i didn’t have many friends at that school but this one girl in one of my classes i got along well with— she let me know she was having a birthday party soon (like party party, 40ish people) and i’m invited, i check her bday party groupchat to see who i know a little more formally are her and 5 others 3 i’ve never properly spoken to and the other 2 i stopped ages ago after they paired off together. And God does it get worse. Literally everyone in this groupchat know/are friends with each-other

I haven’t been doing a lot of fun things so i thought this would be a fun opportunity (it’s a wig party too) but i’m super fucking nervous because i feel like i’m an irrelevant member there that half of them don’t even remember. Alcohol would be involved tho. Help.