(CANCELED due to a twisted knee.) Join Naturalist Emily Stone at the North End warming hut at 1:00 p.m. for a quick workshop on winter tree identification. Then strap on your skis for a fun competition! Participants can skate or stride the 5k A-Loop while stopping to identify marked trees along the way. Back at the warming hut, enjoy hot chocolate and cookies while we wait for everyone to finish. Answers will be checked, and prizes will be given! Finish by 4:00 p.m. Brought to you in partnership with the North End Ski Club. Call 715-798-3890 to register by January 6. $5 member/$10 non-member.