In “Judgment Week,” acts compete for a spot in the live performance shows. Celebrity judges Howie Mandel, Mel B, Heidi Klum and Howard Stern narrow down the competition and announce the top 48 acts. Nick Cannon hosts this series. “America’s Got Talent” airs on Tuesday, July 22, 2014 at 9 p.m. ET/PT and Wednesday, July 23, 2014 at 8 p.m. ET/PT on NBC.