When OP said "not invited" I think that means his sister actually said "you can't come".

Go find your own fun

My siblings never invite me, I'm just there. I do spend most of it in my room, but sometimes I come down to say hello. My brother did kick me out of the house two years running for his birthday party though, and both times one of his mates passed out and threw up in my bed :/

go anyway. slap that bitch

It's your house, what does she expect you to do? Stay in your room? F*ck that!

Just join anyways, what is she going to do? It's New Years, have fun:)

YDI for having a sister

Invite some of your own friends over and do what you want. I mean, if she is paying for all the food and booze, then you should probably get your own food. But other than that? Do as you like.

sabotage it. pull every prank in the book. fart bomb the bathroom, spike the punch with laxatives, hide the tv remote, eggs in shoes, pull the house breaker 30sec to midnight. I'm sure u can think of more. Make it a new years to remember. :D

Show up anyway and crash the party.