Date (happened)
6 November 1961 (probable)
delivery claim d1 on lecture nid=1822 identifies the fire Neville describes visiting as the well-documented Bel-Air fire of 6 November 1961 (library of first editions and art lost, only a manuscript and suit saved) -- used there as a lower bound for the lecture's own delivery date, but it is itself the happening date of this event.
Told / reported
between 6 November 1961 and 26 May 1962 (probable)
delivery claim d1 on lecture nid=1822: bound 1961-11-06..1962-05-26, confidence=probable, state=confirmed -- lower bound from the Bel-Air fire (6 Nov 1961) being described as already past, upper bound from the lecture looking ahead to a still-future class 'on the 26th of May'. d0's point estimate (circa 1962, preferred) sits inside this interval and is noted there as consistent.
Neville went to see the burnt home and the burned brush on the night Aldous Huxley's house burned to the ground, Huxley losing his library of first editions and art objects and saving only the suit on his back and his last manuscript.