Chicago's biggest music festival welcomes 400,000 attendees to Grant Park for a four-day music festival that's packed with some of the biggest names in pop, rock and hip-hop. SZA, Tyler, The Creator, Blink-182, The Killers and more headline the fest this year, joined by acts like Future X Metro Boomin, Hozier, Stray Kids, Melanie Martinez and Skrillex. Check out our comprehensive guide to Lollapalooza, including the full lineup and schedule, for more info.