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.
Happened as dated, per the source: the 2023 Las Vegas Grand Prix was run as "the first running of the Las Vegas Grand Prix" with a historic 10pm lights-out start.
Wikipedia confirms "the 2023 Las Vegas Grand Prix... was a Formula One motor race that was held on November 18, 2023," the sport's return to the city after 41 years - matching the pin's stored date exactly.
LVSportsBiz's own September 2022 article on the date being set quotes the schedule ("Race: November 18") over a year ahead of the event, independently corroborating the 18 November 2023 date the pin stores.
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.