You can camp for free in the paddock, or stay in a local hotel.  Friday night they'll cook hamburgers and hotdogs and people hang out talking.  Saturday night there's a pig roast and a band.  Last weekend there was drift cars for passenger rides (the line was a hour and a half long), a huge car show and fireworks.
New drivers would be in A-novice and have an instructor riding with them.  Then one gets promoted to A-solo and then on to groups B, C & D as one gets faster.  Drivers in B & C groups can take passengers, so you can catch rides with different people in different cars that are way faster than you.  It's fun and you see things from a different perspective.
You get 5 - 25 minute driving sessions per day.  Everybody is very polite on the track.  In groups A, B & C you can only pass when the guy in front of you gives you the signal to pass him.  Group A-novice also has classroom time in between driving sessions.
Warning!  Once you've been out on a track, it can be addictive.