Date (happened)
  • 20 September 1966 (probable)
    phase4 lecture_event_match decision=different; evidence passage(s) 550313 in lecture nid(s) 1965; Lecture-event match (different): event 8562 — Passage 550313 describes the Tuesday-and-Friday week collectively, not one candidate delivery.
  • between 20 September 1966 and 23 September 1966
    passage 550313 (lecture nid 1965), 'Next week we're speaking on Tuesday rather than Monday... I happen to know that next week it's going to be Tuesday and Friday.'
The same week's second lecture (Friday) fell on 1966-09-23, per the same passage.