Kalshi gave away $50 in free groceries for 3 hours in New York City. A line 4 blocks long full of students and people on food stamps formed

WestSide Market CEO George Zoitas did not expect so many people to come. For 22 years and counting, Zoitas has been expanding the mom-and-pop grocery store across New York City to the point where its name is misleading—it’s also the EastSide Market, not to mention the Uptown and Downtown one, too.

On Sunday, Zoitas told Fortune, he was at the Knicks game and met some people from the predictions marketplace Kalshi, who offered to pay for an event where shoppers could receive $50 each in free groceries between noon and 3:00 pm.