Hi everyone. My first post on this forum
Yesterday i got invited to a party by a girl who i previously gamed a bit, made out, hung out a couple times with. She lives far away (like 80km) so i didn't have the opportunity to start a relationship with her. So it's more casual. I'm wondering how in your opinion i should act at the party. My goal is to have sex with her (hotel/party, preferably at the party). How in your opinion should I act? Should I talk/dance (I'm a pretty good dancer) only with her? Generally how much attention should I pay to her? Should I take her and open a couple sets? Should I talk to other girls and pay little attention to her? And advice welcome

Yes sorry i cant help you.. i too have the same situation dude.
For me its different.. i met this girl 2 weeks ago at a club.. we were talking all night.. hanging out all night.. anyways the next day she asks me if i wanner come to her party .. HER B.DAY party!! so yeah im not sure how i shud act at this party... same question as you...

Jeez lads of course you can talk to other women, it's not as if they're some alien species, and you're doing nothing wrong by talking to them. Hang around with her, hang around with other people, drink, dance, have fun, then move in for the kill. Buuut if your goal is to have sex with her then I don't recommend you detach yourself too much from whoever you target is, you want her to see that you're building value within the party and you're having fun, women are attracted to fun dudes.
My two cents.

have fun, chat with everyone you can