Chicago police said two men suffered knife injuries during an argument outside of Lollapalooza.
The men had been at the music festival earlier Saturday evening and were arguing. The men in their late twenties suffered minor cuts around 11:20 p.m.
Authorities said neither man wants to press charges.
Police said the men were taken to Northwestern Memorial Hospital and reported in good condition.
The annual music festival was stalled briefly Saturday afternoon as a powerful thunderstorm rolled through the city.