A triduum (; ) is a religious observance that lasts three days.
In Eastern Christianity (both Orthodox and Catholic) the analogues of festive tridua take the form of a major feasts followed by an associated Synaxis. The most publicly celebrated examples are the feast of Epiphany together with its eve and the following day dedicated to Saint John the Baptist, and the Christmas with Christmas Eve and the Synaxis of Theotokos.
Ecclesiastical approval has been granted for tridua in honour of the Trinity, the Eucharist and Saint Joseph. Tridua are also celebrated on the local level, often preceding the feasts of patron saints of parishes and localities. An example would be the Obando Fertility Rites in the Philippines, which commemorate Saint Paschal Baylon, Saint Clare of Assisi (in addition to her actual feast day), and Our Lady of Salambáo for three consecutive days in mid-May.
In January of 1915, a number of German cities observed a triduum of meditation on World War I, an event which was influential on a young Martin Heidegger.
James G. McGarry, a Catholic priest and professor, organized a 1977 triduum observance at Knock Shrine.
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