It is not overtime and not a game to watch. At an event, you are working. If you are lucky you get to look to see a particularly good play but most of the time not. And the officers are likely working extra hours off the city clock. Meaning, they are not getting overtime.
I highly doubt all of that. They work an extra day and don't get paid for it, same as if they stayed home? Lol! And they're not keeping an eye on the game while there? Lol again.