I have done a few of these so I will try to answer.
1. You can ride the bike to the track; many people do. I trailer because I want to be able to change in/out of the leathers and have food, chairs, coolers, etc handy. Also you will be tired at the end of the day and it is nice sitting in a cage driving home.
2. I would bring lunch and drinks as there are no facilities outside of a Biffy. Sun shade is also nice to have.
3. All you have to do is tape over your lights. In addition I would remove the mirrors and blinkers if feasible. Use 3M Blue wide masking tape; it comes off easily without leaving residue.
Tires in good shape and not worn out.
Brakes in good shape.
Tighten all bolts down so nothing falls off your bike and make problems for other riders.
Chain properly adjusted.