Your own water crocks/bottles and feed crocks or feeders. The convention supplies these, but they may not be what your rabbits are accustomed to using, or may not be large enough.

Water from home. Having water they are used to drinking may help your rabbits transition.

A small bag of feed. While major feed companies supply feed for the convention, the brand you feed may not be available.

Colored plastic ties, stickers or something unique to identify your cages and assist you in locating your rabbits.

Cardboard to put between the cages if your rabbit is cooped next to a biter or a sprayer.

A desire to have fun and make new friends!