In the ladies lounge of The Waldorf Astoria, at a charity event for Senegal by The International League for Human Rights, the door bursts open. In spill a couple of women in Balenciaga & Balmain, laughing in mid-conversation. Strains of Youssou N’Dour playing live waft in.One woman raises the hem on her silk sheath to reveal a big red welt on her upper left thigh. The second pulls out a plastic rig from her Minaudiere and says, “Should have used this one.” The wounded gal digs into her own clutch and places a similar opaque contraption on the marble counter.