The city's most spoiled high school seniors are getting ready to par-tay tonight. Six single-sex, blue-chip private schools—Collegiate, Browning, Brearley, Hewitt, Spence, and Nightingale-Bamford—will hold their group prom tonight in the fittingly hoity-toity location of the Waldorf-Astoria's Starlight Room. The Sun has the color on the event, and also takes the occassion to delineate all the ways Rich Manhattan Private School Proms differ from mere Middle-Income Suburban Public School proms. There are tons of them, it turns out!