As a librarian, one of my favorite things was library programming. Planning special programs was a great way to get to know students and provide outlets for them to learn about topics of interest. Football 101 might be a great way to help someone like me better understand this sport. This could easily be targeted at girls or open to all students. Snacks could have a football theme. The goal of this programming would be for these students to gain an understanding of the game. Obviously, you probably don't want to provide the instruction if you are not knowledgeable on the sport. Instead invite local coaches and players from local colleges or if you are a middle school, invite those from the high school.
Be sure to share your fiction and nonfiction titles that address football. Also, consider having a viewing party in the library one weekend or even for the Super Bowl. It could even be a family event.