What should a teen girl wear to a rock concert?

I'm going to the Carolina Rebellion this Saturday. It's an all-day music festival with Avenged Sevenfold, Three Days Grace, Stone Sour, Bullet For My Valentine, and several other bands. I'm not sure if it's inside or outside. It's warm here for the most part, but it can get a bit chilly at night and the concert doesn't end until around midnight. What do you think I should wear? Thanks in advance! :)