The Marché campagnard Les trésors du Santerre brings farmers, producers and local sellers together in Chaulnes. The monthly rhythm makes it part of everyday rural culture rather than a one-off fair, while the Santerre name gives the event a clear territorial anchor. Visitors come for regional food, producer contact and a market atmosphere that reflects the agricultural landscape around Chaulnes. The market gives the Santerre a visible public meeting point and keeps local supply, village life and seasonal buying in the same place.