Festival Codex is the register of the date — a reference atlas of world festivals, classified by how their dates behave.
Every festival calendar in the world is a list of months. The Codex asks a different question: what kind of date is this? Some dates never move. Some are pinned to a weekday — the third Saturday of July, the last Tuesday of January. Some are governed by Easter and swing across thirty-five days. Some follow a lunar calendar and drift through the Gregorian year until they belong to no month at all. Some are seasons rather than dates.
And some are not annual at all. The Fête des Vignerons has been held twelve times since 1797, which means a reader planning a trip will not find it in most of the years of their life. A month column cannot hold that, so the Codex records the behaviour as the primary fact — it is the one that decides whether a traveller, a planner or a publisher gets the date right.
797 festivals across 103 countries. 652 of them carry a machine-readable recurrence rule rather than a sentence of prose, which is what lets the atlas answer a question a calendar cannot: what are the dates in 2029? The answer comes as 3,300 computed occurrences across 2026–2030, each carrying how knowable it is.
An arithmetic weekday rule and a Hijri calendar conversion are not the same kind of certainty, and the Codex does not print them as though they were.
The same discipline runs through the figures. Every attendance number states what was counted, in which year, and who published it. Where no one publishes a usable figure, the refusal and its reason are recorded instead of an estimate.
A broadcast audience is not a crowd, and a figure without a year is an unfilled field rather than a fact. A festival with no published attendance is a finding, not a blank.
Not when festivals happen — how their dates behave.
