Randonneurs USA defines randonneuring as: “long-distance unsupported endurance cycling. This style of riding is non-competitive in nature, and self-sufficiency is paramount. When riders participate in randonneuring events, they are part of a long tradition that goes back to the beginning of the sport of cycling in France and Italy. Friendly camaraderie, not competition, is the hallmark of randonneuring.”
Seattle has a very active randonneuring club which sponsors brevets throughout the year. A brevet is a 200k, 300k, or longer cycling event. Saturday morning a 200k event occured in the Olympia area. I have wanted to participate in such an event but my cycling style wears me out too quickly. The event started at 7 AM and the riders were given about 13 hours to finish the course.
Each brevit has a detailed set of route instructions and a control card which has checkpoints that must be visited and checked off on the card by a volunteer at the specific point or location. These locations usually have restrooms and access to food and coffee.
Olympia has a custom builder of bikes for these type of events. His name is Corey Thompson. From what I can observe at his website a fully designed custom built bike runs a bit over $5000. https://thompsoncustombicycles.com/