Backstory: Every time I tailgate I see a lot of leftover food sitting outside as we walk to the stadium. Why not donate it to the local homeless?
The Idea: Sport events leftover donations.
Deep Dive: You could walk the different tailgate spots and hand out bright colored insulated bags to parties with large people. You would pitch them to fill the bags with their leftovers before they enter the stadium. You would walk around near the start of the event and collect the bags to distribute to the local homeless population.
Validation: Helping the hungry while cleaning up the stadium? Win win.
Monetization: By encouraging the tailgaters to clean up their space you may get some financial support from the stadium. You would have to file this as a non-profit.