Arrests at Lollapalooza this year were down from 2019, the last time the festival took place at Grant Park, city officials said.
A total of 19 people were arrested at the four-day music festival, a drop from 31 arrests in 2019 but up from the 12 in 2018, according to the Office of Emergency Management and Communications.
The city also recorded 102 ambulance transports this year, down from 116 in 2019 and 160 in 2018, officials said.
Police also issued fewer citations this year. Officials said seven people were ticketed this year, fewer than the 12 in 2019 and a fraction of the 34 recorded in 2018.
OEMC gave no details of the arrests, transports or citations.
In 2020, Lollapalooza shifted to an online-only event due to the pandemic. The festival went ahead this year despite a rise in coronavirus cases, with the highly infectious Delta variant sparking a surge nationwide.
A day into the festival, organizers announced that masks would be required at all indoor spaces on festival grounds following updated guidance from the Chicago Department of Public Health.