"Smiles Against Cancer" partnered with the Midway Culver's for the fundraising event on Tuesday.
Participants greeted customers, worked the drive-thru, and even served meals.
Culvers will donate a percentage of every meal to "Smiles Against Cancer." The Chicago non-profit organization was founded by 11th grader Alexander Jimenez when he was just 9 years old.
He says his organization is "dedicated to help put a smile into every kid's face that is battling cancer."