First, the Salt City Derby Girls will host an outdoor expo bout at the Gallivan Center (239 S. Main) in downtown Salt Lake City, starting at 3 p.m. The SCDG played Los Angeles' Angel City Derby Girls in California last weekend and, even though they lost, your local ladies put up what's been reported as a hell of a fight (literally, but that's for the referees to sort out). Admission for the Gallivan bout is $5, and don't worry about the weather--it still probably won't be as cold as the icy Utah Olympic Oval, where the SCDG used to play before moving to the Salt Palace last year.
If you're too lazy to make it to either event, look for past Salt City Derby Girls roller derby bouts on Comcast On Demand (Utah On Demand section), or just go see Whip It already: