CNN  —  A$AP Rocky’s grandmother stayed up all night at his Met Gala after party while waiting for one special person to arrive. The rapper appeared alongside Vogue editor-in-chief Anna Wintour on Wednesday’s episode of “Late Night with Seth Meyers,” where he talked about how he partied with his grandmother Cathy at the Met Gala after party he hosted Monday night until they left at 8 a.m. the next day. “She was really ambitious about going because she wanted to meet her husband,” he said,