Neville's lecture meeting on January 31, 1967
Date (happened)
No date
relative
Why
Anchor under adjudication in L1.4 (candidate npr 60353, evidence #2242). Convert to a calendar claim once that rules.
Reasoning
The offset itself is exact and certain - Neville names the next meeting as Tuesday of the following week from the platform. What is not certain is the anchor: nid 1258's delivery date is contested between catalog 1967-01-27 and chrome dateline 1966-12-02, resolving this event to 1967-01-31 or 1966-12-06. The relative form states everything that is actually known and commits to nothing that is not.