Columbus (OH) Zoo, free entrance & parking on 11/20/15 with food donations
If link doesn't work, just go to the Columbus Zoo's website and go to the calendar.
It's called the Wildlights Stuff the Food Truck Drive.
5 non-perishable food items for every person to enter. Show food to parking attendant and they will waive the parking fee. From 5pm to 9pm on 11/20/15 only.