The Sep'er Trail de Guilly is a trail-running and walking event held in Guilly, France. The meeting point is under the bandstand next to the church. Participants can select an 8 km or 15 km trail race, or an 8 km or 15 km hike.
The event supports multiple sclerosis research, allowing participants to run or walk for the cause, not just for their best time. Trail runners register via HelloAsso. Hikers sign up on the day at the event, contributing to its straightforward local atmosphere.