The four-day festival returns to downtown Chicago from Thursday through Sunday, bringing more than 170 artists across eight stages. Graphic by LollapaloozaLollapalooza street closuresThe following closures are in effect, according to the Chicago Office of Emergency and Communication. A dozen people were arrested over the four-day weekend and 42 people were transported by ambulances. What started as a traveling festival has since transformed into a multi-genre music powerhouse. Since 2005, it has called Chicago’s Grant Park home – drawing hundreds of thousands of fans each year and cementing itself as one of the city’s signature summer events.