The feast of St. Demetrius, celebrated on October 26th, is a significant event in the Orthodox Christian tradition, commemorating St. Demetrius of Thessaloniki, a martyr and military saint. In connection with this feast, the "Saturday of Souls" (also known as "Psychosabbaton") is observed on the Saturday before or after the feast, dedicated to prayer for the departed. The faithful gather in churches to offer prayers and commemorate the souls of their loved ones, emphasizing the importance of remembrance, community, and the hope of resurrection in the Christian faith. This tradition underscores the unity of the Church, both living and departed, in Christ.