My EC and I both went to prom. Not together, as we didn't meet until college - but we both went. She went to hers in a fantastically decorated small town, High School gymnasium, and I to to a high-dollar resort where the couples who were too drunk to drive home just got a room for the night. (True!)
Prom is a signature event in the life of many a high-schooler. It is the big finish, the time to act fancy and pretend to be a grown up. Much has changed over the years, but some things have stayed the same. It is still a big deal for many, and can be great fun, but it can also come with abundant drama.