La Crépynoise begins on Cours Foch in Crépy-en-Valois and takes place in October, coinciding with Octobre Rose, the breast cancer awareness initiative. USC Athlétisme organizes this solidarity event, which includes children's races, 5 km and 10 km races for adults, a 7 km walk, and a family mountain bike excursion.
The courses follow the streets of Crépy-en-Valois. The 5 km race is open to participants from the minimes category upwards, and the 10 km race is for cadets and older. Participants include families, friends, walkers, runners, and cyclists. All proceeds benefit the Ligue Contre le Cancer du Sein de l’Oise.