Neville's lecture on February 20, 1964
Date (happened)
20 February 1964
unresolved
20 February 1964
stated · probable · preferred
Source
derived from the event's own title: "Neville's lecture on February 20, 1964"
Reasoning
The event held NO date claim of any kind; its own title states 1964-02-20 (day precision, parsed as "month day year"). ⚠ A title in this corpus is a DERIVED artefact — an earlier pass wrote it from the passage text — so this claim is title-derived and is marked as such rather than cited as a source document; the underlying text remains the real evidence and would supersede it. Confidence `probable`, never `certain`, for that reason. Precision is never inflated beyond the title's own wording. CALIBRATION (run v1.1/l1.4/titledate, against the 489 events that already hold an independent preferred date): day 96.1%, month 94.1% agreement. Titles naming a REFERENCE event rather than the event itself ("before", "after", "during the week of", "per ... lecture") are refused outright and never reach this write — reading an anchor as the date is the same laundering phase3b committed when it wrote telling dates onto events.
20 February 1964
estimated
Reasoning
In the Tuesday 1964-02-18 lecture Neville refers prospectively to 'Thursday night.' Advancing two civil days gives 1964-02-20; independent weekday calculation confirms February 18 was Tuesday and February 20 was Thursday.
Told / reported
18 February 1964
estimated
Reasoning
The upcoming Thursday lecture is announced in node 1776, whose 1964-02-18 delivery is independently corroborated by its recovered dateline and a matching catalogue claim. || v1.1 type repair: written as `stated` by run v1.1/l4/actor456/7500-7999-b1, retyped `estimated` — the claim cites node 1776, not a passage, so it is this lane's inference rather than something Neville said in so many words (#2117).