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Birkie Trail Run & Trek Kicks off this Saturday on the Legendary Birkie Trail One day. Eight events. Introducing NEW Ultra 100K Marathon! Hayward, WI (September 22) — The 14th annual American Birkebeiner Ski Foundation® (ABSF) Birkie Trail Run & Trek, Presented by Salomon, will be held on the iconic Birkie Trail this Saturday, September 26th. From the challenge and intensity of a new 100K Ultra Marathon to the fun of a 5k run/walk, an...