A memorial in the Roman Rite of the Catholic Church is a lower-ranked feast day in honour of a saint, the dedication of a church, or a mystery of the religion.
All feast days are ranked according to their importance and named as "solemnities", or "feasts", or "memorials".
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The Memorial of the Holy Guardian Angels is a memorial of the Catholic Church officially observed on 2 October. In some places, the feast is observed on the first Sunday in September with the permission of the Congregation for Divine Worship. Catholics set up altars in honor of guardian angels as early as the 4th Century, and local celebrations of a feast in honor of guardian angels go back to the 11th Century. The feast is also observed by some Evangelical Catholic parishes within the Lutheran Churches, as well as by Anglo-Catholics within the Anglican Communion and most churches of the Continuing Anglican movement.