Luke Bryan and Pitbull are the latest headliners announced for Summerfest, a concert series taking place June 26-30 and July 2-7 in Milwaukee, festival organizers announced Thursday (March 28). Other headliners at the Marcus Amphitheater include Tim McGraw and Jason Aldean. Bryan will appear on July 3 with Thompson Square and Florida Georgia Line. Aldean, Jake Owen and Thomas Rhett are scheduled for June 27, and McGraw will appear with Brantley Gilbert and Love and Theft on July 5. Additional dates have been confirmed for Tom Petty & the Heartbreakers (June 28), Pitbull (June 30) and the Eagles (July 7). Other headliners include the Violent Femmes, Fun., New Kids on the Block, Rush and John Mayer.