Multiple independent sources confirm that the 2025 All-In Summit was held in person in Los Angeles over September 7–9, 2025, at the Shrine Auditorium and Expo Hall.

• The All-In website’s group sales page advertises “Los Angeles, CA | September 7-9, 2025” for All-In Summit 2025, clearly describing a live, in-person conference format with networking, keynotes, and on-site experiences. (allin.com)
• An event listing for “The All-In Summit 2025” notes the event “September 7 @ 8:00 am - September 9 @ 6:00 pm PDT” at the Shrine Auditorium and Expo Hall, Los Angeles, CA, and marks it as an in-person, already-completed event. (eventbrowse.com)
• A summarized history of the All-In Summit describes the 2025 summit as held in Los Angeles from September 7 to 9, following prior annual summits in 2022, 2023, and 2024—making 2025 the fourth annual summit. (en.wikipedia.org)
• Another listing for “All-In Summit 2025” likewise specifies Sept 7–9, 2025 at the Shrine Auditorium and Expo Hall in Los Angeles. (app.qwoted.com)

The prediction claimed that the fourth annual All-In Summit would be an in-person event in Los Angeles on September 8–9, 2025. In reality, the summit did occur in person in Los Angeles and ran September 7–9, so the dates September 8–9 were indeed core days within the actual event. Since the only discrepancy is that the event also included September 7 (which does not contradict the claim that it would be held on the 8th and 9th), the prediction is best judged as right rather than wrong on a technicality.