Some posters document a show. This one documents a show that never happened — and that is exactly why it matters. On Thursday, October 2, 1969, the marquee at Bill Graham's Fillmore West read one thing and the stage delivered another, and the gap between the two is one of the better small heartbreaks in the Graham catalog.

Two months earlier, Crosby, Stills, Nash & Young had walked off the Woodstock stage into instant myth. Graham booked them for what the poster promised as their first-ever San Francisco shows — a long weekend built around CSNY, with Blues Image and John Sebastian (lately of the Lovin' Spoonful, fresh off his own barefoot Woodstock turn) underneath. Greg Irons drew it: a lush, Woodstock-ethos image that collectors still rank among the loveliest in the series. The print run went out the door. Then CSNY postponed.

What Graham did next is the part worth lingering on. Rather than go dark, he pulled in two of the heaviest draws he had on hand — Janis Joplin, touring behind the Kozmic Blues Band, and Santana, riding the wave of their own Woodstock breakout and a debut LP that was about to go to the moon — and kept Blues Image and John Sebastian on the bill. So the poster on the telephone poles said CROSBY, STILLS, NASH & YOUNG, and the people who walked in got Janis and Santana instead. Per chickenonaunicycle's Fillmore West list, the run played four nights, October 2 through 5, with the engagement entered flatly as "Janis Joplin, Santana, Blues Image / John Sebastian, Lights: Little Princess #109" — and a dry archivist's footnote that says everything: "Poster Says CSNY."

The catalog number is **BG-194**, and here the record needed correcting. The working seed for this day guessed "likely BG-195." It isn't. BG-195 is the following week's Fillmore West poster — Country Joe & the Fish with Albert King and Blodwyn Pig, October 9–12, a Randy Tuten piece. The CSNY poster is BG-194, and both Wolfgang's and Heritage Auctions attribute it to Greg Irons; Wolfgang's calls it his last poster for Graham, a claim I'd treat as plausible-but-unconfirmed since it travels with only those two linked listings. The artifact that survives, then, is a BG-194 advertising a bill that never took that stage — the designer's name, the dates, and the wrong headliner all locked in ink before the lineup changed under it.

That substitution is not folklore. Wolfgang's handbill page and the Heritage lot description both tell the same story independently: CSNY "forced to postpone," Joplin and Santana "stepped in," the poster "already gone to print." And the substitute show was real and recorded — tracks circulating as "The Fillmore, San Francisco, CA – October 1969," including a "Raise Your Hand" and a "Bo Diddley," place Joplin and the Kozmic Blues Band squarely on that stage. For a crowd that showed up hoping for the Woodstock supergroup, Janis Joplin and Santana is not a consolation prize; it's one of the great accidental double bills of the year.

Two honest wrinkles belong in the open, not buried. First, the dates. The poster — and the auction houses cataloging it — read "October 2–4," three nights, Thursday through Saturday. COAU lists four: the 2nd, 3rd, 4th, and the 5th. The likeliest reading is that the printed poster under-sold the actual engagement by a night, but I'm flagging the one-night gap rather than smoothing it. Second, the venue. The poster text names "Fillmore West **and** Winterland," and the auction listings repeat it, yet COAU files all four nights at the Fillmore West. Whether any night genuinely moved across town to Winterland I could not confirm from the reachable archives — the kind of detail that tends to live on classicposters.com or famsf.org, both of which are closed to this pipeline. So I'm recording the venue split as an honest gap and anchoring the page on the Fillmore West, where COAU puts the music.

What's not in doubt: Thursday, October 2, 1969 — the weekday checks out — a Greg Irons poster numbered BG-194 went up advertising Crosby, Stills, Nash & Young, and the people who answered it heard Janis Joplin and Santana instead. The poster is the hero here precisely because it's wrong. It's a printed promise the week couldn't keep, and the week was arguably better for breaking it.