Black Ball

The stars line up for Keep a Child Alive's Black Ball, an event started in 2004 by KCA cofounder Alicia Keys. Ms. Keys will host and perform at this black-tie gala, with performances from Janelle Monáe, Sade and Jay-Z. So if you're out to support a good cause—and have a significant amount of cash to burn—head to this affair, where all proceeds support children afflicted with HIV/AIDS in India and Africa.