Strikeforce: Playboy Mansion was a mixed martial arts event promoted by Strikeforce. The event took place on September 29, 2007 at the Playboy Mansion in Los Angeles, California. The invitation-only event drew nearly 1,000 spectators who paid $1000 per ticket. The event was supervised by the California State Athletic Commission. Fights 5 to 12 were streamed live on Yahoo Sports for free.

Submission Underground 27 took place Sunday, October 10, 2021 with 10 fights in Portland, Oregon.

Submission Underground 22 took place April 25th from Portland, Oregon.

Submission Underground 23 takes place on May 23, 2021 in Portland, Oregon.

Submission Underground returns to Portland, Oregon with an eight-man absolute tournament featuring some of the top submission-only grapplers and jiu-jitsu players in the world. The winner of the whole tournament will receive a handsome cheque of $10,000 and a title shot at the champion Mason Fowler on July 18th. 2nd place will receive $5000 whilst 3rd place will receive $2500.