A few years ago, I brought up the Rubber Ducks, who play less than a mile away (a 20 minute walk) from campus.
If you haven’t been to a minor league game, they keep fans entertained. Games, prizes, T shirt launchers, stuff for the kids (get ‘em interested early). There’s games and videos on the Jumbotron when there’s a lull. It’s often silly but in engages fans.
There are simple ways to engage the fans that doesn’t cost a whole lot.