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.
Scheduled, per the race's 12K page: "Run the iconic Bay to Breakers[2] 12K in San Francisco on May 16, 2027!".
The race's home page: "Join the legendary Bay to Breakers[1] in San Francisco on May 16, 2027! ... a city tradition since 1912".
Background: 7.46-mile course, 1986 Guinness record of 110,000, about 25,000 in 2025, founded after the 1906 earthquake.[1]
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