This is probably a good place to say more about spectating....
Schedule can be found here.
Friday driver's meeting at 3-4pm. This means that most all cars (god willing) will be there for viewing before and after meeting. Some cars will leave for dinner but they wont be gone for long. Fun night. Everyone could still be the winner!
Saturday morning at 8am, cars are broken into groups and they go two laps left and two laps right, on a wet (sprinkler) track. In theory, your one and only allowed pair of tires are their newest and have their most tread (to help you in the rain.)
The early running cars (fastest cars) will leave the TireRack as early as 9:00 to drive the 1 hr to Grissom for a autox that starts at 1:00pm.
In general, One Lap events are a daytime/early thing. Lets take day 2 at Nashville. Track opens at 7:00 for walking of the track. Gives the driver's a little time to see the track. Bikes and scooters are allowed but I think anything "powered" is not allowed. At 8:00 the first cars are brought out in groups of about 6 cars at a time. By about 11:00, all the cars will have done their "morning session." There will be a little break for "timing crew lunch" and car will begin the afternoon session about 12:30, again starting with the fastest cars. Once cars are individually done with their afternoon session, they are free to leave and advance to the next venue (6-10 hr drive!) By 3:00 pm it is intended that all cars (including Rios) will be done and gone to the new town.
Super cool thing for spectators!!!! During that lunch break 11-ish to 12-ish, Brock himself will lead visitors through "touring laps" for 10-20 minutes. Speeds are moderate but still fun. So, if you plan to spectate, bring with you a car that is "track fun" and doesn't leak anything! Best part...its free to spectate and touring lap! But, expect that you'll need a wrist band and have to sign the waiver at the gate.
Don't be like myself many years back where I figured I'd quit work early to get to the event for some spectating. I arrived at track about 3pm, just to see the last cars packing up and leaving for the day. But, on the road in, I was passed by some cool cars leaving in the other direction. If you plan to spectate you'll want to be there as early as reasonable.
Lanier could be interesting this year since the first car doesn't go off until 5pm. That could be a "leave work early" type thing for spectating.