I am not sure where you’re from, and how dressed up you are going to be at this party (in Germany for instance, the typical party includes putting on a nice top and straightening your hair, while in Ireland people would invest like 4 hours in hair and makeup in my personal experience)
You could always go ahead and straighten your hair, although I think curly hair is always a pretty sight at a party… At the top of my head I can think of three particular hairstyles.
A girl in my year had her hair in a deep side part the other day, and I really liked it, cause she had these really tight ringlet curls, so her hair was standing up really cute and sassy in a way. So a deep side part would be something I could picture someone with curly hair wearing to a party. For a side part, you should always imagine a straight line up from the arch of your eyebrow and that’s where your side part should begin.
Secondly, I think waterfall twists/braids look really good with curly hair, especially if you have more lose waves. I posted a tutorial a few days ago, and I sometimes wear my hair like this, and people compliment it a lot, because it looks like you made an effort, and everyone thinks it’s very hard to do.
Thirdly, braiding is your friend. Braiding the front section of your hair away is always an option, or you could go for a braided headband. You could obviously skip the parts where you curl your hair, but it gives you a good idea how your headband could look. By the way: holding up the upper layer of the side on which you secure the hair and securing it under the layer, will give it an “it just vanished” effect, while braiding it into the direction your actually want your hair to go will spare you of any weird root parts.
Regardless of what hairstyle you chose, I hope you have fun going out and enjoy yourself ;)