The Extreme North Dakota Twelve Hour Mountain Bike of Enduring Delirium: it's their annual epic Halloween themed bike race! Taking place in Turtle River State Park, the riders will ride solo or as part of a relay team to try to get in as many laps as possible in 6 or 12 hours. The course has lots of windy single track, some fast double track and even a smidgen of road riding (which you'll be loving by the end).
Two Ways to Race
Registration/More Info: https://endracing.com/end-tombed