How is it that the Orthodox Easter is rarely celebrated at the same time as that of Western Christianity? The reason lies in the different Christian calendar systems, which the author explores historically and compares with the Jewish and Islamic calendars. Another chapter is dedicated to the central Christian festival, Easter, and the Easter cycle in its Roman Catholic form. This is followed by a discussion of the content and form of the other festivals throughout the year. The conclusion provides an overview of the festival culture in other Christian churches. As in "Crash Course in Liturgy" and "Liturgy in the Rhythm of the Day," the author combines a wealth of information with a well-readable presentation, supported by numerous schematic overviews.