Separate fixed dates from feasts whose place follows Pascha. This page starts with that question because it is the most useful way into the subject. It names the visible structure, keeps the vocabulary plain and points to the source trail instead of asking the reader to accept an unexplained conclusion.
The useful distinction here is between a pattern in the calendar and a date announced for one particular place. Fixed commemorations and the movable Paschal sequence can be studied together without being collapsed into one timetable. The Feast & Form Index gives this explanation a place among related records: feast, season, office, object or visual cue. That arrangement lets a reader arrive through ordinary language and leave with a more precise term.
The editorial boundary is deliberate. We do not assign a current schedule, repeat private contact details, or turn a local custom into a universal rule. When the evidence is limited, the page says so and offers a nearby source, such as the source register or the method note.
A civil calendar shows the same mechanism at work, which can make it easier to see. Secular commemorations are almost always fixed rather than movable, and the labour of keeping them falls on a municipality rather than a parish: a route, a permit, a rain date, a published order. A magazine that records one American county's fixed summer date, documented year after year is a useful lay comparison, because it shows how a fixed observance accumulates local custom around an unchanging square on the calendar. The theological questions are not the same; the calendrical habit is.
A calendar can also be read as a sorting system. A year kept by season rather than by date follows the same logic that separates a fixed commemoration from a movable one, even when the seasons themselves are reckoned differently.
