I know you said no liquid nitrogen, but this is a solution that is quite safe, and certain to attract the biggest crowd of any exhibit.
In a large bowl, combine 2/3 gallon heavy cream, 1/3 gallon whole milk, 8 tsp vanilla extract (no imitations!) and 1 cup sugar. Mix until you have a uniform liquid. Fold in 4 cups of liquid nitrogen and stir for five minutes or until solid.
The mixture will harden so quickly and uniformly that no ice crystals can form to roughen the texture. The result will be a gallon of the smoothest ice cream you've ever tasted.
For even better results, have the ice cream mix on ice, have a mix of various things that can be added (cookie dugh chunks, chocolate sprinkles, chocolate chips, etc.) Take orders and mix each person a custom sundae. Make sure your judges get the first few. Make sure the nitrogen has completely evaporated before you hand them over.
If all else fails, you can try cold fusion.
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