Divine Liturgy of the Holy Righteous Ones

The Holy Prophet-King David, Saint Joseph the Betrothed, and Saint James the Brother of the Lord are commemorated on the Sunday after the Nativity. If there is no Sunday between December 25 and January 1, their commemoration is moved to December 26.

The rest of the explanation is found at:  https://www.oca.org/saints/lives/2021/12/26/86-sunday-after-the-nativity-commemoration-of-the-holy-righteous-da