The Vault Bar and Grille promoted on its Facebook page a street party Saturday night.
McLean County Sheriff Mike Emery said 25-year-old Haleigh Hall was there because she was wearing a Vault wristband.
Hall died early Sunday in a car crash nearby.
Coroner Beth Kimmerling said alcohol could be a contributing factor in her death.
Emery said Tuesday while no wrongdoing has been officially determined yet, he said his office never tolerates drinking and driving.
He said all parties must be held accountable.
"We do what we can to try and prevent driving under the influence of alcohol, but we can only do so much. We have 1184 square miles in McLean County that need to be patrolled. We can't be everywhere," he said.
Emery said his department works with I-DOT to conduct DUI enforcement.
He said Hall's crash is still under investigation, and part of the investigation includes making sure the bar didn't do anything wrong.