carryover from the tech forum --
link to autocross Novice handbook, which also lists things to bring with you.
http://www.tirerack.com/features/solo2/handbook.htm
A little dated, but still useful. There are some variations to the sequence of events (i.e. we all do a coursewalk before the drivers meeting), but it'll give you some idea before you go the first time.
Car numbers: for your first couple of events, you can use tape on the door panel to display your car number; but if you want to run regularly, you'll want to upgrade beyond tape. Last year, I bought some bendable magnet material from a place on Mill St., used my computer to print out my numbers, traced them onto the magnet stuff, and cut them out. They work great. You can also spend more $$, and buy professional-looking static cling or magnetic numbers if you want.