The Fashion Show Mall (across from the Palazzo and the Wynn) has a free show during the Christmas season. From
a Review-Journal article on things to do in Vegas during the season:
“Believe in the Magic,” a free holiday production featuring holiday traditions around the country, on the runway in the Great Hall between Nordstrom and Saks Fifth Avenue at noon, 2, 4 and 6 p.m. Nov. 29-Dec. 1 and Dec. 6-8, and daily at noon, 2, 4 and 6 p.m. from Dec. 13-24.
Here are a couple photos that I took last year during one of the shows: