Tom Petty and the Heartbreakers, Rush, fun., Tim McGraw and many more will be at the 45th annual Summerfest in Milwaukee, WI. The festival—which takes place June 26-30 and July 2-7—is the world’s largest music festival (according to the Guinness Book of World Records). This year’s event will feature more than 800 acts on eleven stages throughout eleven days. Petty will perform on June 28 and Rush will take the stage on July 4. Tickets to the festival and some of the headlining shows are currently on sale for various prices. More headliners will be announced in the near future.