Question

I'm not going to buy my tickets in advance because there should be plenty of seats and I'm not positive if I'll make it on time, so it's better to wait, right?

Answer 1

In this scenario, yes, you should wait. If you know that there is a possibility that you won't even show up and that there will be extra seats anyways, there's absolutely no reason you should rush to buy the tickets and risk wasting money.