Bonsour Christine,
I would suggest that you pick up several of the free magazines and pocket guides. That seem to be just about everywhere. The airport has a information center. By the baggage pick up/car rental area. Where you can get several different ones, and someone is usually there to answer any questions. There are about 6 or 7 different ones. These magazines and guides tell a person just about everything happening in Las Vegas. Be sure to get the December issue.
I just got back from there. And there does not seem to be a huge amount of Christmas offerings.
I do suggest, you go to the Bellago atriun. Their christmas display is fantastic.
Have a great trip and a very Merry Christmas.
Dan