I have been to several GoodGuys events and always enjoy them.
To answer your question the car entry ticket comes with two full weekend passes one for you and one for your wife. For the others in your group you can buy full pass for all show dates or just the days you want and can take care of that at registration.

You can not leave your car at the event over night. Need to drive the car in and out of the event area and they usually have a place for trailers outside of the event area like spectator parking outside of Lowe's Motor Speedway.

If you can take advantage of the Thursday Cruise where you tour many of the NASCAR shops. Kind of like a poker run.