Upon further review it appears the Stooges played one gig at the Grande in February of 1968.
An ad from The Fifth Estate newspaper that ran in the Feb. 15-29, 1968 paper has an ad for the Psychedelic Stooges.
The Byrds headlined a Feb. 18 gig that also included the Psychedelic Stooges, The Rationals and Wilson Mower Pursuit.
Also there's another worthwhile write-up on the band from the Nov.28-Dec. 11 edition of The Fifth Estate.
John Sinclair, the manager of the MC5, wrote about the Stooges in his Rock & Roll Dope Column on Page 17.
Here it is.
"Blue Cheer was blown away again in their second Detroit appearance at the Grande, Nov. 21st, when the Stooges unleashed their new set.
The Stooges sound better every week, and that Thursday night they were stronger than they've been since last March, when I saw them for the first time and came all over myself. There were times in their show when the music passed into pure magic, rising and rising in intensity until it was felt more than heard. They'll start work on their first Electra album in Los Angeles in late February with John Cale from the Velvet Underground producing."