I think there is a small chance he won't show because of some last minute thing he makes up. But I'd say 90% chance he does. I think he honestly thinks he will mop the floor with her, but if you stand back objectively, he is going to get crushed. But you know what? It won't matter because most of the FOX news crowd won't watch and the pundits will spin it so hard afterwards you won't recognize what just happened. That's' the way authoritarian fascists work. Up is Down. War is Peace. 2 + 2 = 5...
But you know what? Trump isn't trying anymore because he thinks his election tampering, legal challenges and the supreme court are going to save him and install him as president so what is the point of running a real campaign anymore...