Hey @ak81! Welcome!
Definitely tough to say what they'll play but if you look over the last handful of shows it would give you a sense for what's being played right now. This summer the band played a lot of festivals and that meant shorter sets with "showcase" songs. All In got a lot of play, Electric Taco Stand, Shake You Loose, Slip and Squander also saw a bunch of action. But again, it's tough to guess.
You can click on any song and you'll get the stats for the recent play history. The lower the gap numbers the more often the songs are played.
Your best bet is to just listen to as much Spafford as you can between now and then. :) If you've got Nugs then you can check out this link:
but if you don't you might just want to hit up the free soundboards: