If you go on this date, she will think that you don’t care enough about football to schedule around it. You’ve just set the expectations. However long this relationship lasts, that is what she will hold you to. And she will resent every time she perceives you prioritizing football, feeling that she was misled as to what she was getting.

You had one chance to get this relationship off on the right foot. You muffed it. Now it will inevitably lead to disappointment. Better now than later.

Call the date off and enjoy the game.