My first Autocross is tomorrow!

I totally cleaned out my car, it was quite exciting:


I only have one concern: what kind of chalk/shoe polish will work? That's the only thing that I don't have.

EDIT: Actually, I have two more concerns. I don't have a helmet, but I'll assume they rent them. And also, I don't have a rearview mirror. It came off, I can fix it, but I don't have the time right now. I'll also assume that this doesn’t constitute a safety violation.