Friday, August 19, 1966 is the rival-twins night at the very beginning — before Fillmore West, before the Avalon's fame had set, when the two rooms were still learning the weekly rhythm that would define the era. At the Fillmore Auditorium, Bill Graham hung BG-24: the Young Rascals — the blue-eyed-soul hitmakers of "Good Lovin'," visiting Eastern pop royalty — over Quicksilver Messenger Service, the local guitar band still two years from a record. Wes Wilson drew it, one more in the astonishing fourteen-month run of posters he was producing at nearly one a week (per wolfgangs, which dates BG-24 to Aug 19 and credits Wilson). A mile away that same night, Chet Helms's Family Dog answered at the Avalon with the "Frankenstein" poster, FD-22 — see that entry.