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.
defcon.org[2]'s Future Dates: "DEF CON 35 Aug. 5-8, 2027 at LVCC West Hall. Stay tuned for details."
The previous edition's venue page gives the West Hall's address (3150 Paradise Road) - the same hall DEF CON[1] 35 returns to.
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.