That's genius. You get her to think that the trip to Independence is some sort of romantic picnic, start setting everything up and let tell her that you forgot something, run back to the car and go play in the tournament, you come back with some wine and brie and she's none the wiser.Or you could buy a bouquet of roses pack sandwiches in a basket and grab a floor blanket. And have a wonderful time. I'll let you fill in the skipped steps.
Wasn't this the plot of a Flintstones episode once?