Frank06,
Bob can probably best answer this, but I can give you an idea in case you need to let friends know soon. There will usually be a driver's meeting before racing starts. Most often it gets under way around 9:00, although Bob may try to get it done a little sooner. Even so, it's the driver's themselves who drag down to the meeting and hold up the start. As soon as that's over, there will be a track drive-through parade for the racers to get a look at the track, studying surface, turnouts, etc. Right after that, racing will start, and that usually happens a little before ten.
There is not set sequence for classes. Racers will move out to the starting grid and get in line (or it might be a couple of lines) and the starter will start running them one at a time. As soon as one clears the track, another will go. Street bikes, street cars, race bikes and race cars run at random, based on when they got in line. a 90 mph S-10 pickup might be followed by a 220mph blown Hiabusa.
There is usually about an hour break for lunch (the track workers like to eat too), and then racing gets back in gear. Sunday will be a repeat of Saturday, but since everybody is familiar with the sequence of events, racing might start a little sooner.
This is approximate. Bob might straighten it out a little bit for you.
DickJ
In East Texas