I'm going to Park City, Ut for the Film Festival. I wear UGGS while I'm there, but the soles slip in the snow?

I slipped and fell last year. The soles are in great shape, and lots of wear left on them. Any suggestions? Is there anything I can put on the bottoms to help with grip? I'm a native Southern Californian, living in Texas, with no "living in snowy conditions" experience. Thanks!