organisation, organization, arrangement, system - an organized structure for arranging or classifying; "he changed the arrangement of the topics"; "the facts were familiar but it was in the organization of them that he was original"; "he tried to understand their system of classification"

embolism, intercalation - an insertion into a calendar

lunar calendar - a calendar based on lunar cycles

lunisolar calendar - a calendar based on both lunar and solar cycles

solar calendar - a calendar based on solar cycles

list, listing - a database containing an ordered array of items (names or topics)

docket - (law) the calendar of a court; the list of cases to be tried or a summary of the court's activities

table, tabular array - a set of data arranged in rows and columns; "see table 1"

perpetual calendar - a chart or mechanical device that indicates the days of the week corresponding to any given date over a long period of years

schedule - plan for an activity or event; "I've scheduled a concert next week"