Strikeforce: Shamrock vs. Gracie was the inaugural mixed martial arts event promoted by Strikeforce. The event took place at the HP Pavilion at San Jose in San Jose, California on March 10, 2006. The main event was the long awaited match between Frank Shamrock, returning to the sport after a 3-year absence, and Cesar Gracie. The show is also notable for featuring the MMA debut of Cung Le. This was the first Strikeforce event.

Strikeforce: Revenge was the second mixed martial arts event promoted by Strikeforce. The event took place at the HP Pavilion at San Jose in San Jose, California on June 9, 2006. The main event featured the North American debut of Alistair Overeem.

World Extreme Cagefighting returned to The Palace Indian Gaming Center in Lemoore, California for the ninth installment of promoters Scott Adams' and Reed Harris' emerging event. With a few big name guys and a packed stable of home grown talent, the WEC has started to make a push towards the top of the pack when it comes to regional events.