Well some important things I can think of off the top of my head:
- Deoderant, cause no one likes smelly pepole in the pits.
- 2 pairs of socks for evey day you will be there. Tip from a mentor on our team who does 24 hr auto racing. You can not believe what a fresh pair of socks does when your feet are tired.
- Camera (if your phone doesnt already have one or that one isnt good enough) Cause you know you will run across something cool you want to snap a pic of
Just a few of the things I thought of off the top of my head, I know im probably forgetting some things. But thats why i start packing a week ahead of time.