Evidence before coverage

What counts as evidence

Only a page controlled by the organiser, or a submission platform linked from that page, can support a published deadline. Search results and conference directories can help locate a moved page, but their snippets never count as evidence.

How a date is confirmed

We fetch registered official sources on a risk-based schedule. When content changes, two isolated structured extraction passes must agree. The date must pass edition, event-order and stale-page checks, and its exact supporting quotation must occur in the fetched text.

What happens when evidence changes

A changed or missing date enters rechecking. Near-term uncertainty is withheld sooner than uncertainty around a distant event. Conflicting official sources are suppressed immediately. We never publish a candidate date merely because it looks plausible.

What the labels mean

Official source confirmed

One authoritative source passed all automated checks.

Corroborated

Two distinct official pages support the same date.

Rechecking

The source changed and the previous date is inside its limited warning window.

Temporarily withheld

The evidence is unresolved, so the date is excluded from lists and feeds.

Limits

No automated system can promise perfect accuracy. Always confirm before submitting, booking or paying. The defensible promise is narrower: every displayed date retains official evidence, and uncertainty is withheld rather than guessed.