We have been fans for years, finally spent the money to go. All of the action is near the chutes, not much goes on in the middle of the arena, and nothing at the other end. Sit on either side of the chutes, not too high. Really depends on how much you want to spend. It is a great show, very kid and family friendly. Get there early and get some autographs before the show, they also are available after.
Sounds like Thurs and Fri are the qualifying rounds with Sat being the finals.
But one of my wife's best friends married a rider and we've been to a few over the last couple years. They're an absolute blast; you're grandsons will love it.