In Eastern Christianity, Saturday of Souls, which is a day set aside to remember the souls of those who have died, is recognized on a Saturday because Christ lay dead in the Tomb on Saturday.
According to Eastern Christian tradition, when someone's physical body dies, they do not cease to exist, but rather their soul continues to exist in the spiritual realm. This day is dedicated to honoring those souls.
Here are some ways you can observe this day according to Eastern Christian tradition: