From Olivia Rodrigo to Doechii, some of the world’s biggest music stars flooded to Chicago for the four-day music festival.

To keep people safe, Chicago police set up camp outside, and EMTs were on hand at six medical tents at the music festival.

Doctors at Rush University Medical Center previously said they anticipate seeing 10 to 20 extra patients a day in the emergency during the event—some come in for a drug overdose.

Lollapalooza’s first days were pageants of both new talents and star sensations. Summer has swung back around, and with it the annual closing of Grant Park and North Columbus Drive to accommodate the ...