How should I style my hair for prom?

Hi everyone!
Okay so, I have Prom this upcoming Friday, and I have no idea how to do my hair, so I was hoping some of you might have suggestions. If it helps at all, my dress is royal blue, long, with a column skirt, cap sleeves and embellishments on the neck line. And my face is kind of long, if that helps with hairstyle suggestions. I need something fairly simple (not necessarily quick) and something that will stay put.
Thanks everyone!