You cannot camp on the salt but you can (and many people do) camp at "the bend" a couple miles from the salt.
Weather this time of year -- lows about 62, highs 90-low 100's depending on how the weather is acting on any given day.
The bend is without a doubt the cheapest. Some folks just toss a sleeping bag on the ground and sleep beside their car, others go the whole route for a nice tent or RV.
Schedule is basically sunrise to near sun set. In the morning, the cars that qualified the day before will move from impound to the starting line and run their "backup runs" to attempt to complete their record (average of two back to back passes). Then after they complete their runs, then any car can run on any course it is qualified to run on.
They will run until about 5:00 pm (depending on wind and weather, as high winds can shut things down). Everyone needs to be off the salt by about 7:00 pm or so.
Early morning before the record runs is a good time to cruise the pits, it is cool and the light is good for photos.
Bring good sun glasses, a hat and sunscreen. Without them you will be a crispy critter by early afternoon on the first day.
Bring some sort of fluids to drink! It will be difficult to stay hydrated so drink constantly. If you are not peeing several times a day you are not getting enough fluids.
Some sort of viewing shelter is highly recommended, minimum is a good umbrella. Sitting in the car gets pretty hot unless you are running the AC constantly.
Admission is $15 for a day pass and $40 for an event pass (you will want to do the event pass) you get the event button as well, and you can come and go as you please.
Time to run for the fast cars varies by the team. There are a few cars that like to run at the heat of the day (aerodrag is slightly lower), others run early in the day when it is cool which gives a bit more power and helps keep the engine alive if it is cooling challenged. Others decide based on the salt conditions, the salt tending to get slicker as moisture content comes up, so the will try to run when the salt is hard and dry if possible.
Enjoy!
Larry