The Brief Lollapalooza opens Thursday in Grant Park with more than 170 performances scheduled over four days. Officials are also warning fans about fake tickets, wristband fraud and heavy traffic around Grant Park. Lollapalooza officially gets underway Thursday in Grant Park as hundreds of thousands of music fans are expected to attend the four-day festival in Chicago. Featured articleFestival organizers are reminding fans to follow entry rules before heading to Grant Park. Lollapalooza traffic and transportationSeveral streets surrounding Grant Park are closed for the festival, and heavy traffic is expected throughout the weekend.