Where the data comes from

Tech keynotes

tech-keynotes.json draws exclusively from official vendor announcements: Apple Newsroom (apple.com/newsroom), the Google Keyword blog (blog.google), Microsoft's News Center, Anthropic's press page (anthropic.com/news), OpenAI's blog, Meta Newsroom, Nvidia's GTC schedule, and the equivalents for AMD, Samsung, Qualcomm, and AWS. Dates are taken from the vendor invite where available and otherwise the keynote landing page. Trade press is not used here — vendors announce their own keynotes on the record.

Disclosure events (government & legal)

disclosure-events.json is sourced from government primary materials and a small set of corroborating trade outlets. Primary sources include NARA (the US National Archives), the Department of Justice, the Securities and Exchange Commission EDGAR feed, the Federal Reserve's FOMC calendar, the European Central Bank's Governing Council schedule, the UK Office for National Statistics release calendar, and equivalent national statistics offices.

When a primary source is silent (e.g. a leaked timing for an imminent indictment), we corroborate against at least two independent trade outlets: Reuters, the Associated Press, Bloomberg, the Financial Times, the Wall Street Journal, the New York Times, the Washington Post. Trade-only signals are tagged speculative and do not get confidence: confirmed until the primary source publishes.

Major events (entertainment, sports, culture)

The curated entries in major-events.ts follow source rules by category. Film and TV release dates are taken from TMDb and IMDb release calendars, and verified against the studio or distributor's official site. Sports fixtures use the relevant league's official source — FIFA, UEFA, the Olympic Committee, the NFL, NBA, MLB, NHL, the Premier League — never aggregator sites. Tech-product launches use vendor sites only.

Religious festivals & public holidays

festivals.json and holidays.json defer to the religious authority for each tradition. Catholic and Christian feasts come from the USCCB liturgical calendar (United States Conference of Catholic Bishops) and the Vatican's general roman calendar. Jewish holidays come from Chabad.org and the Hebcal calendar. Islamic dates come from the Umm al-Qura calendar (Saudi Arabia) cross-checked against the Fiqh Council of North America. Hindu festival dates come from drikpanchang.com. Buddhist and Sikh observances come from the major sangha and gurdwara federations respectively. Public-holiday dates come from each country's official gazette or labour-ministry publication.

Sports fixtures

sports-fixtures.json uses the official governing body for each tournament: International Cricket Council (ICC) for international cricket, IPL official for the Indian Premier League, FIFA for international football, UEFA for European club competitions, the IOC for the Olympics, and the equivalent for tennis, F1, golf, rugby, athletics, and esports. Match dates are imported from the official fixture list and re-verified within 48 hours of kickoff against the same source.

Per-source confidence

Government primary sources are treated as authoritative. When a release calendar is published by NARA, the Federal Reserve, or a national statistics office, that date is the record — corrections come from the same source.

Trade press is corroborated against ≥2 outlets. A single Bloomberg story is never enough to flip a date to confirmed. We require two independent trade reports plus, ideally, a primary signal before a non-primary date is promoted.

Community claims are explicitly tagged. Tracked accounts and prediction markets contribute to the estimated window on rumour-tracker pages, never to confirmed dates. The community tier is always rendered behind the speculative-tracker UI so the reader knows what they are looking at.

Corrections & retractions

When a source publishes a correction we update the underlying catalogue and rebuild — the static page's dateModified reflects the change. When a date is publicly retracted (e.g. an event is cancelled), we mark the page retracted rather than deleting it, so the original prediction is preserved for accountability.

Spotted an error? Email the editorial team — see Editorial team.