Need more of a challenge while traversing those black diamonds? New Belgium Brewing Company is inviting Eldora skiiers a chance to double as detectives as they scan the mountain for clues. Teams of four will follow the trail for hints, ski after chickens, and even search for bigfoot. The after-party includes a tap of New Belgium drafts and prizes for top finishers. Last year's grand prize was a pair of custom-made skis. Proceeds benefit Leave No Trace, which provides education on sustainability and the outdoors. Sat 9 a.m.- 4 p.m.