When division games happen, due solely to being so close geographically, plenty of opposing fans infiltrate home stadiums. It's par for the course, unless you're the Green Bay Packers and head coach Matt LaFleur.
After Detroit Lions' fans overtook Lambeau Field in September of 2023, the Packers released this statement.
"The Packers have encouraged our ticket holders to sell to other Packers fans when possible, The secondary market, however, allows fans from anywhere to purchase tickets and Lambeau Field remains a popular destination for all fans, including those from other teams.