Melinda & Cameron
Melinda had volunteered to be a chaperone. She took security very seriously, even at an event like prom. She sort of looked the part, too, as she wore a simple black dress. It was possibly the same one she wore last year. She really didn't care about such things.
Of course, she partly wanted to be here for Lucas, though she made it a point not to be obvious about that. She wasn't checking up on him so much because she did trust him, but she did look over a few times to make sure he was having a good time.
She got Cameron to volunteer as well, mostly so she wouldn't be completely surrounded by teenagers. Maybe it could even be kind of fun. Yes, she did sometimes know what that was.