On Friday, September 29, 1967, the Avalon Ballroom opened a three-night stand that put two very different kinds of virtuosity on the same stage: Vanilla Fudge, the Long Island quartet whose slowed-down, organ-heavy demolition of "You Keep Me Hangin' On" was all over the radio that autumn, headlining over the Charles Lloyd Quartet, one of the most acclaimed acoustic jazz groups in the country (per chickenonaunicycle's Family Dog list and a run of museum records — the Victoria & Albert Museum, the Minneapolis Institute of Art, the Matthew Marks Gallery, and Third Mind Books all carry the poster). The engagement ran Friday through Sunday, September 29 – October 1, 1967, with the North American Ibis Alchemical Company on lights.

The pairing is the story. Vanilla Fudge had essentially invented a genre in miniature — the grandiose, half-tempo rock reinvention of a pop song — and by late 1967 they were a genuine chart act, exactly the sort of touring rock band Chet Helms's Family Dog liked to fold into the local scene. The Charles Lloyd Quartet, by contrast, was a jazz ensemble of formidable pedigree: Lloyd on tenor saxophone and flute, the young Keith Jarrett on piano, Cecil McBee (or Ron McClure, depending on the month) on bass, and Jack DeJohnette on drums. Lloyd's group had made a point of playing the rock ballrooms — the Fillmore and the Avalon among them — reaching the young psychedelic audience directly, and their live album Forest Flower, recorded at Monterey, had made them one of the few jazz acts a Haight-Ashbury crowd would actually turn out for. Putting them under Vanilla Fudge is a quintessential Avalon move: no genre wall, just two acts doing something ambitious with the raw material of American popular music.

The poster, FD-85 in the Family Dog series, is where the antagonist earned its keep. chickenonaunicycle and most dealer listings credit the design to the studio pair "Mouse & Kelley," but the museums that hold the piece tell a different and more specific story: the V&A, the Minneapolis Institute of Art, the Matthew Marks Gallery, and Third Mind Books all attribute FD-85 to Alton Kelley alone — Third Mind Books calling it explicitly a solo Kelley production made within his role at Mouse Studios. Because four independent institutional records agree against the dealer shorthand, this chronicle credits Alton Kelley, while noting that the "Mouse & Kelley" credit is the more common one in the marketplace and reflects the studio partnership under which the pair signed much of their work. It is a small correction, but it is exactly the sort of attribution the record tends to blur, and worth getting right.

Two strong events crowd the same date and deserve naming rather than burying. That same weekend, Jefferson Airplane were at Winterland (Friday and Saturday, the 29th–30th) with Mother Earth and the Flamin' Groovies — the Winterland leg of the Greg Irons BG-85 poster that opens on this chronicle's September 28 page. And in Denver, the Family Dog's satellite ballroom ran its own poster show (FD-84, by Bob Schnepf) across the 29th and 30th — but that one carries a sharp poster-versus-receipt lesson: the poster advertises the Doors, yet the Doors did not play the Family Dog on the 29th at all. They were at the University of Denver Arena that Friday and only headlined the Family Dog on Saturday the 30th; on the 29th in Denver the headliner was Lothar & the Hand People, with Captain Beefheart & His Magic Band both nights (per setlist.fm, Wikipedia's Family Dog Denver record, and concert-poster archives). The advertised bill and the actual stage do not line up — a reminder that a printed poster is a promise, not a receipt.

The remaining years are honest nulls for a poster ballroom show falling on the 29th itself. In 1966 the Avalon was dark that Thursday — the famous FD-28 "Zebra Man" run (13th Floor Elevators and Quicksilver) did not begin until the 30th, and it belongs to this chronicle's September 30 page, not this one. In 1969 the Family Dog on the Great Highway offered only Stephen Gaskin's "Monday Night Class," a lecture rather than a concert, and the Fillmore West was between runs; in 1965 the ballroom scene had barely begun. There is also a historically weighty near-miss worth a hedge: chickenonaunicycle records the Grateful Dead playing the Straight Theater on the 29th and 30th, 1967, in the shows often cited as Mickey Hart's first with the band — a real and important claim, but one that rests on a single reachable source here and is flagged rather than asserted. The anchor for the day stays the Avalon: Vanilla Fudge over Charles Lloyd, and an Alton Kelley poster the museums have quietly set straight.