WEC 31: Faber vs. Curran was a mixed martial arts (MMA) event held by World Extreme Cagefighting (WEC). The event took place on Wednesday, December 12, 2007 at the Hard Rock Hotel and Casino in Las Vegas, Nevada and was aired live on the Versus Network.The main event featured a featherweight title match between champion Urijah Faber and challenger Jeff Curran.