Lady Gaga kicked off the first show of The MAYHEM Ball Tour in Las Vegas, Nevada on July 16 at the T-Mobile Arena. The show marks the first arena show in support of MAYHEM following her Art of Personal Chaos promotional shows earlier this year. To prepare for the show, the Haus of Gaga museum inside Park MGM added new MAYHEM merchandise and several new outfits from the MAYHEM era. The museum now features the dress worn by Gaga for her Copacabana concert, as well as two red outfits worn by the Mi