Cute,
I'd suggest mascara. Lipstick looks great. Ear rings a definite (to me I love ear rings). Cute top. Are you going to wear a skirt or pants with it? What about the shoes, handbag and jewelery? Perfume?
As others have said; key is relax and enjoy. Try not to be nervous and don't drink alcohol. Ok nurse a glass of wine or Champers. Many may 'know' but the more you present and act as the normal woman you are, the less that they will feel you are an outsider.
My first time at a party, all 'regular' people as far as I knew, I was as nervous as hell, they had been advised that I was TG, so they tried hard not to be 'different' to me. Once I did relax I had wonderful conversations with many people. Best party I had been to in my life. I actually enjoyed meeting people rather than hiding in the corner.
Enjoy,
Post about you skirt and your accessories
Hugs and you look great
Cindy