The "pop-up" concert took place at The Independent in downtown San Francisco.
The other members of FAITH NO MORE issued a statement expressing disappointment and throwing support to Patton.
The Brit heavy metal legends are celebrating their 50th anniversary and threw in several rarely played songs.
The trek kicks off November 5 in Oregon.
Fan-filmed video footage of the entire concert was captured.
Support on the dates will come from the all-female rock outfit PLUSH.
Their show at the Azura Amphitheater on Friday night has lawn seats priced at under $10.
Davis says even two weeks after he tested positive, the band has been forced to postpone six dates on its tour.
Listen to Mitch and Steve-Oh this week and next to grab your tickets to the show!
It marked their first full-length live appearance in front of an audience since March of 2020.