VAIL, Colorado - Nearly 50 years ago Vail Mountain opened its lifts and trails to skiers for the first time. Now, after years of evolving into the country's largest ski resort, the 50th anniversary season is underway and guests can look forward to a fantastic lineup of special events and celebrations throughout the week leading up to the official anniversary this Saturday.This celebration kicks off with special 50th anniversary edition of Vail's signature, early-season concert series, which runs until Sunday. Headline acts are Wilco on Saturday, The Shins on Thursday, and Michael Franti & Spearhead on Friday. Tickets and full details are available online at www.vail.com/snowdaze.The premiere of "Vail, the Rise of America's Iconic Ski Resort," a new film by Vail's original filmmaker, Roger Cotton Brown, will take place on Friday at the Vail Marriott Mountain Resort. Although the 5:30 show is sold out, free tickets are still available for the 7:30 and 9:30 p.m. shows and must be reserved in advance at www.vail.com/50th. Additional screenings of the film will take place on select dates throughout the winter at the Grand View Room in the Lionshead Welcome Center. Guests, locals and the entire Vail community can come together to help commemorate Vail's 50th anniversary during a free, public celebration on Saturday at 5:30 p.m. at Mountain Plaza in Vail Village at the base of the resort's new gondola, One. In addition to remarks from special guests, a limited quantity of numbered, commemorative Vail ski boot mugs will be given out along with birthday cupcakes. The celebration will culminate with a fireworks display set to music over Vail Mountain. Check out all the details of Vail's 50th anniversary celebration and Vail Snow Daze at www.vail.com/50th.