Grab tickets and join the fans at a game at Bollaert-Delelis Stadium. If there's nothing on while you're in the area, you might like to check if they offer a guided tour of the grounds.
To explore this sporting facility, head to Lens. There are plenty of other things to see in this area, such as Louvre-Lens, Canadian National Vimy Memorial, and Notre Dame de Lorette National Cemetery.