Think about what kind of food you want to snack on.
There are restaurants near the Minnesota Center for Book Arts -- there's a nice coffee shop with soups and sandwiches in the building -- so probably don't bring actual meals.
But then again, you will be awake most of the night, and you may want a nibble at a time when the restaurants are closed.
There will be a donated snack area where you can share snacks with other cartoonists. Maybe think about bringing something for that, too.