The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Stated as firm, per the National Park Service: "Tuesday, March 17 ... Ceremony: 11 a.m. - 1:30 p.m." (EDT, 15:00-17:30 UTC).
Dorchester Reporter: hundreds attended on Tuesday 17 March; organised by the South Boston Citizens' Association and the NPS[1].
WBUR's report from the procession and ceremony, the speeches and the $30 million monument restoration.
Revolution 250's history of the siege and the evacuation, and the commemoration's order of events.
Something missing or wrong? Say it in your own words: a link that backs this pin up, a different start or end date and why, or a fact it lacks or gets wrong. The AI checks it against this pin's sources, searches for better ones, and adds any page that backs you up. The pin's own sources still count most.