structural:summarization, information:classification
Feast day

The current General Roman Calendar, revised in 1969 as instructed by the Second Vatican Council, celebrates Saint Gregory the Great on 3 September. Before that, it assigned his feast day to 12 March, the day of his death in 604. Following the imposition of Pope John XXIII 's Code of Rubrics in 1961, celebration of Saint Gregory's feast day was made practically impossible, as John XXIII's reforms forbade the full observance of most feasts during Lent, during which 12 March invariably falls. For this reason, Saint Gregory's feast day was moved to 3 September, the day of his episcopal consecration in 590, as part of the liturgical reforms of Pope Paul VI.The Eastern Orthodox Church and those Eastern Catholic Churches which follow the Byzantine Rite continue to commemorate Saint Gregory on 12 March which is during Great Lent, the only time when the Divine Liturgy of the Presanctified Gifts, which names Saint Gregory as its author, is used.

Other churches also honour Gregory the Great:

A traditional procession is held in Żejtun, Malta, in honour of Saint Gregory (San Girgor) on Easter Wednesday, which most often falls in April, the range of possible dates being 25 March to 28 April. The feast day of Saint Gregory also serves as a commemorative day for the former pupils of Downside School, called Old Gregorians. Traditionally, OG ties are worn by all of the society's members on this day.