Saturday is the day which the Church has set aside for the commemoration of faithful Orthodox Christians departed this life in the hope of resurrection to eternal life. Since the Divine Liturgy cannot be served on weekdays during Great Lent, the second, third, and fourth Saturdays of the Fast are appointed as Soul Saturdays when the departed are remembered at Liturgy.

In addition to the Liturgy, kollyva (wheat or rice cooked with honey and mixed with raisins, figs, nuts, sesame, etc.) is blessed in church on these Saturdays. The kollyva reminds us of the Lord’s words, “Unless a grain of wheat falls into the earth and dies, it remains alone; but if it dies, it bears much fruit” (John 12:24).The kollyva symbolizes the future resurrection of all the dead.

Read more at: https://www.oca.org/saints/lives/2021/03/27/11-2nd-saturday-of-great-lent-memorial-saturday