The 2012 Womenâs Flat Track Derby Association (WFTDA) Western Region Playoffs was held at Craneway Pavillion in Richmond, California on September 21-23. WFTDA, the international governing body of womenâs flat track roller derby, “promotes and fosters the sport of women’s flat track roller derby by facilitating the development of athletic ability, sportswomanship, and goodwill among member leagues.”