I'm going to uninvite my girlfriend to vegas
Why don't you want her to go to Vegas?
She's a real party pooper, she will keep me from throwing a big bash.
Talk to your girlfriend about your party plans during the trip and ask if she is still interested in going with you.
You sure know a lot about things, listen I will do whatever I want.
You can definitely do whatever you want, but think of how much better you'd feel if you experienced the trip with your girlfriend's permission.