It's hard to believe, but in some parts of the South, there are still privately organized segregated proms. Sunday's NYT Magazine had a good article about the proms of one such high school in Montgomery County, GA.
“My best friend is white,” said one senior girl, a little glumly. “She’s in there. She’s real cool, but I don’t understand. If they can be in there, why can’t everybody else?”
It's a depressing state of affairs, but rather than moralizing, the story's writer, Sara Corbett, does an excellent job of capturing the tension between so-called tradition and social realities of the school. I recommend reading the whole thing. The audio slide show is also well worth watching.