Bruno Mars, Usher Performing in Vegas This Summer Get your summer outfits ready, it’s been announced that Bruno Mars and Usher will be performing in Las Vegas this summer. Bruno Mars will be performing at the Park Theater at MGM Park beginning on July 3. Usher will be performing at The Colosseum at Caesars Palace on July 16. Tickets for the Bruno Mars show go on sale this Friday. Tickets for usher are on sale now. Do you plan on traveling this summer?