Local hospitals also worked well into the morning, treating an influx of patients who had overdosed.
Police say the problems stem from the Bassnectar concert which played to a full house at the US Cellular Coliseum.
The artist known for his electronic music and light shows also performed in Bloomington last year.
Even then officers dealt with people who'd taken drugs like ecstasy, acid, and bath salts.
About 6,000 attended Friday night's show.
Police say fights broke out after with many sent to jail.
Meantime, hospitals also kept busy treating patients who'd come from the concert.
Both OSF St. Joseph and Advocate BroMenn Medical Center had extra emergency room staff on hand to provide needed care.
Each facility brought in more workers for this purpose; following the aftermath of last year's Bassnectar concert.
Patients were still being treated Saturday afternoon.
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