At 11:21 p.m., a stabbing was reported at South Columbus and East Jackson Drives.
The initial police dispatch report indicated two people were stabbed, but subsequent information suggested there was only one stabbing victim.
An injured male was transported to Northwestern Memorial Hospital in unknown condition.
According to the last update, a security officer was holding an alleged offender for the police.
On Friday, a 53-year-old man was stabbed on the 200 block of South Michigan Avenue, just steps away from the three-day music festival.
If more details become available, this article will be updated accordingly.