Submission Underground 13 took place Sunday, April 26, 2020 with 10 fights in Portland, Oregon

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

Submission Underground 8 took place Sunday, May 12, 2019 with 6 fights at Roseland Theater in Portland, Oregon.

Submission Underground 12 took place Sunday, March 29, 2020 with 9 fights in Portland, Oregon.