Monday, 22 January 1990
Trocadero Theatre
Philadelphia, PA, USA
supporting Voivod with Soundgarden
[No setlist details]
Tour t-shirt dates (22nd Philadelphia)
CV Database
Audience recording
Soundgarden Live Guide
Voivod gig list

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.

The Philadelphia Inquirer, 24 Jan 1990, page 5D - gig review
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"."
This show included a "massive food fight" - Tampa Tribune, 2 Feb 1990, page 5F
On This Day:
Year Venue State/Country
1988 Dingwalls, London England
1993 Hollywood Palladium, Los Angeles CA, USA