Honestly it would vary based on each person's appetite. They have a 100 chicken finger tailgate that includes Cane's sauces when you order it, but that's less than 2 chicken fingers per person. I'd say people typically eat 3-6 chicken fingers, so you'd probably want to get at least 2 100 tailgates and then add in some slaw and Texas toast, if you're assuming every one of those 65 people are going to have at least 3 chicken fingers.
I agree with Colin Flack. Pot luck style is probably easier with that many people.
4 piece chicken platters
Call in and ask them about catering and give them a heads up!
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