August 11, 1967 was a Friday, and it is the hero of this date by the chronicle's placement rule — oldest year, anchored by a poster — as a Steve Miller Blues Band night on the back half of the Electric Flag run at the Fillmore Auditorium, BG-77 (Bonnie MacLean). By August 11 the week's trickiest scheduling question was mostly, if not perfectly, resolved. Moby Grape, billed early in the BG-77 run, was by now three nights into its own Avalon headline stand (FD-75); the Steve Miller Blues Band had been added to the Fillmore bill for the run's back half, playing beneath Mike Bloomfield's Electric Flag, with the Southside Sound System in the third slot all six nights. The University of Delaware finding aid for BG-77 lists Steve Miller on the same sheet, which is why August 11 is safely a Steve Miller night — the genuine ambiguity in this run sits on August 10 (where Corry Arnold's Moby Grape chronology still books the band at the Fillmore even as the Avalon advertised it), not the 11th. It is a clean example of why a single-poster bill can mislead: BG-77 prints "Moby Grape" across the whole run, but by August 11 that band was a mile away at the Avalon and the Fillmore stage was Steve Miller's.

August 11 in 1968 was a Sunday, and it closed two significant three-night runs at once — a reminder of how dense the calendar had become by the second full year of the Fillmore West. At the Fillmore West it was the last night of the Eric Burdon and the Animals / Blood, Sweat and Tears / Gypsy Wizard Band bill, the back half of Lee Conklin's six-night BG-132 poster (the same sheet whose Chambers Brothers front-half opened August 6). Across town at the Avalon, it was the closing night of Steppenwolf / Siegel-Schwall / Santana under Billy Glover's FD-132 — the early third-billed Santana appearance the chronicle heroes on August 9. Two different posters carrying the same number, 132, in the same week, in two different series — the Bill Graham BG-132 (Conklin) and the Family Dog FD-132 (Glover) — a coincidence worth flagging so the two are never merged.

There is a smaller, non-ballroom thread on August 11, 1967 as well: the Straight Theater on Haight Street, the neighborhood's own cooperative venue, ran Patrick Sky, Mount Rushmore, and Freedom Highway (with the Dossier, the Straight's resident live-theater group) that Friday. Chickenonaunicycle's Straight Theater list preserves the bill; no poster catalogue number is confirmable for it, and the Straight's homemade handbills are their own under-documented corner of the scene, so we note the show without asserting an artifact.

So August 11 is, like much of this week, a day of endings and substitutions rather than premieres: Steve Miller standing in for Moby Grape at the Fillmore, two big Sunday-night runs closing on competing stages in 1968, and a co-op theater on Haight Street quietly running folk and rock a few blocks from the ballrooms. The hero is the anchored 1967 Fillmore night — the Electric Flag's BG-77, with the Steve Miller substitution made plain — but the day's real texture is in how many things the scene could close out on a single mid-August night.