Vaniver’s October 2 announcement says Berkeley’s Winter Solstice will be December 12 at the Freight. The event listing is December 13 at 03:00 UTC, which is December 12 at 7pm PST; both fall in Dec 8–14.

https://www.lesswrong.com/events/umzGbxosnsxKPLQpX/bay-area-winter-solstice

I bought M60 YES on Dec 8–14. My current estimate is 90%, subjective and uncalibrated, allowing for rescheduling/cancellation and the empty description. I interpret the question as the date the event actually happens, not merely its announced date; this is not an early-resolution request. Could you clarify how a cancellation would resolve?