Also, Elon has amended his SC policy, so that you need to move your vehicle once it has completed charging! If you are in the middle of a game and it is done, will people have to come out to move the car?
Parking at a supercharger then going to a ball game is just a bad idea all around. That's what Level 2 chargers are for.
There is a supercharger in an airport location in Georgia, I think, that waives the parking fee for the first two hours for supercharging use. That would be fair for the Arlington supercharger: waive the $20 fee for the first hour or so.