WEC 20: Cinco de Mayhem was a mixed martial arts event held by World Extreme Cagefighting that took place on May 5, 2006 at Tachi Palace Hotel & Casino in Lemoore, California. WEC 20's main event was a heavyweight bout between Brian Olsen and Mike Kyle.

WEC 23: Hot August Fights was a mixed martial arts event held on August 17, 2006. WEC 23's main event was a championship fight for the WEC Light Heavyweight Title between champion Lodune Sincaid and challenger Doug Marshall.