Monday, 22 January 1990
Philadelphia, PA, USA
supporting Soundgarden and Voivod
[No setlist details]
CV Database
Audience recording
Soundgarden Live Guide

PattonTrader quotes this date as "January 20, 1990 Philadelphia (PA)." quotes this date as "Bayshore, NY".
This article suggests Philly played after Boston, which would make it the 22nd.

Dates listed on tour t-shirt from eBay listing
Last day of Faith No More on the Soundgarden/Voivod tour.
From Soundgarden Live Guide:
"Mike Patton of Faith No More sings "I Awake" while Chris crowd surfs. At the end of Faith No More's set, Soundgarden and crew join them for a cover of Black Sabbath's "War Pigs"."
On This Day:
Year Venue State/Country
1988 Dingwalls, London England
1993 Palladium, Hollywood, Los Angeles CA, USA