A ticketed date with no art, which is its own kind of entry. On Wednesday, September 10, 1969, the Incredible String Band -- Robin Williamson and Mike Heron's Scottish outfit, a year on from "The Hangman's Beautiful Daughter" -- played a midweek one-off at Fillmore West, the night before Bill Graham opened his BG-191 weekend with Steve Miller, James Cotton and Keef Hartley. The show is documented by its ticket. What it does not have is a poster, and there is a specific trap here worth naming: the BG-ISBg-1 Pat Hanks String Band sheet that sometimes gets filed against this date belongs to a separate Incredible String Band show on December 10, 1969. It does not attach to this night. Graham ran plenty of midweek bookings that never got a printed card, and this is one of them -- a real show that the poster catalogue simply cannot see.