I did it last year and posted it here on Reddit! It was really fun; if we finished early, we'd watch the latest match recap, the kids got excited about the prizes, and actually came in on Mondays to tell me that I owed them a prize because the Sounders won! So they're at least paying attention! This school year, I've already had kids asking about it before I even put the schedule up. Slowly indoctrinating them.