1. Selection
The calendar is editorially selected. An event is included when it draws an international audience to a place at a fixed time and shapes that place while it runs — the criterion is significance to the season, not attendance. The working universe is a few hundred events a year across 16 circuits and the categories listed on the events page. Volume is not a goal; a low-quality event is never added to fill a month.
2. Dates and their status
An event is one permanent record. Its dates are separate rows — one per edition, and one per staging where an event happens twice a year — each with a status, a source URL and the date it was verified:
- Confirmed — the organizer or governing body has published these exact dates.
- Expected — not yet announced; projected from the event’s fixed pattern (the previous edition shifted by 52 weeks so weekday alignment holds), flagged as an estimate.
- Date pending — the pattern is not fixed enough to estimate; only the usual month is stated.
- Historical pattern — an event whose organizer publishes little in advance; dates from previous editions.
- Completed — the edition has taken place, with its actual dates.
- Cancelled — announced as not taking place.
Sources of truth, in order: the organizer’s official site; the governing body (FIA, ATP/WTA, ITF, R&A, USGA, FEI, La Biennale and so on); the venue; government tourism offices; reputable publications. Anything other than Confirmed is displayed with a dashed marker in the calendar, described in the JSON and ICS feeds as tentative, and listed in the editors’ queue.
3. Freshness
A daily job opens review flags for upcoming editions that are not yet confirmed within 120 days, for confirmations older than six months, for official websites that fail, for changed dates and for events with no photograph. Flags close automatically when the underlying row is fixed. The public change log records every date that changes and why.
4. Destination activity graphs
“When [destination] matters” is not an opinion. Each event on a destination’s calendar contributes its Circuit Score, spread evenly across the days it occupies in the reference year (this year, else the nearest edition, else the usual month). The twelve monthly totals are scaled so the busiest month reads 100. The events responsible for each bar are listed beside it.
5. Where now, coming next, the season line
“This week” is every live edition overlapping Monday to Sunday of the current week, ordered by Circuit Score. “Next major move” starts from the week’s defining event and follows the highest-scoring starts after it, one stop per destination. The season line collapses consecutive events in one place into a single stop and marks the current position. All of it is computed from the edition table at request time; nothing is hand-placed.
6. Overlaps and the weekend index
Overlaps are found by date first (editions active within five days of each other) and then by geography: same destination, then within a radius on the great-circle distance between venues, then the same country. The weekend index sums the scores of events active over each Friday-to-Sunday span and ranks the spans; it measures density of activity, not quality.
7. Photographs
Every image is checked at seed time and at render time by the same rights gate: it must carry a creator, a source URL, a licence and a licence URL, and the licence must permit commercial reuse. Images without a readable licence are never downloaded. Attribution is rendered in one block at the foot of each page. See the image licensing policy.
8. What the site will not do
It will not speculate about which individuals attend an event, describe private parties, publish prices it cannot source, or present a projected date as a confirmed one. Where a fact is missing the page says why — “not published by the organizer”, “date pending” — rather than leaving a blank.
Siehe auch die Methodik des Circuit Score, redaktionelle Standards und Datenquellen.