The highly anticipated Lollapalooza 2026 festival has officially started in Grant Park, showcasing headliners like Lorde and John Summit on its first day. The event, which marks its 35th anniversary, features a packed lineup including local acts such as Smashing Pumpkins and international artists like Charli XCX and JENNIE. While festival-goers express excitement for the performances, heavy rainfall is forecasted, raising concerns about potential flooding and storm disruptions throughout the weekend. Despite the weather challenges, attendees can enjoy a range of brand activations and livestream options available through Hulu and other platforms. As Chicago prepares for large crowds, local authorities have implemented security and transportation measures to ensure a smooth experience for festival-goers.