Definitely watch as many races as you can before you go. You'll have a much better understanding of what's going on when you get to the track. Here at Racing Forums,
@TexasRaceLady starts a new discussion on Sunday afternoon just before each race starts. It will be pinned to the top of the list. If you're new to NASCAR or racing in general, those discussions are great ones to ask questions about what's going on.
You might consider the $30 GA tickets for the two races on that Saturday. These are races for the developmental series; think of them like minor leagues for up-and-coming drivers. You'll get two shorter races, with time between them to move from one viewing area to another. (It’s common at a road course to move from one section of the track to another, checking out the action from different angles. ) There will be fewer people on Saturday so you'll have better views, and the parking and concessions will be less crowded. That would let you decide which vantage points you prefer for Sunday and which to skip.