I was looking at a poster site and discovered an unknown Dead show. The link is here.
The poster advertises The Grateful Dead with Mint Tattoo and City Blue at the Oregon State University Coliseum, in Corvallis, Oregon on Friday, November 15, 1968. The dead were scheduled for Vancouver on Saturday, November 16 and then Eagles Auditorium in Seattle on Sunday, November 17. Most San Francisco bands like to play dates in two or three of the Northwest cities on a weekend, as it made sense to stop in Oregon on the way to Seattle or Vancouver. I do not see this show listed in Deadlists or Dead.net, and up until now knew nothing about it.
According to Deadlists, the Vancouver show on Saturday the 16th was canceled, but the Dead played two shows in Seattle, one an afternoon benefit. I wouldn't be surprised if the afternoon show was only possible because the Saturday show in British Columbia had been canceled. The Moody Blues were playing Eagles on Friday and Saturday, so they couldn't add a show there on Saturday night.
This begs a couple of questions:
was the Corvallis show canceled, along with Vancouver? My guess is that it was not, because it may not have been financially viable to do only one paying gig in Seattle for the entire trip.
was there a stealth show in Oregon or Seattle on Saturday night? This is intriguing, because if you were in a rock band and had a free Saturday night in the Northwest, what would you do? We need to keep our eyes open for unexpected Dead sightings in the Northwest on November 16, 1968, because they might be true.
Mint Tattoo was a Bay Area based band featuring Sacramento musicians, guitarist Bruce Stephens and organist/bassist Burns Kellogg (plus drummer Gregg Thomas). Mint Tattoo released an album on Dot in 1968, and then Stephens and Kellogg joined Blue Cheer in 1969. I don't know anything about City Blue; presumably they were a Corvallis band.