The Last Great Day, or eighth day, is a manifestation of how Jesus Christ will complete His harvesting of mankind by raising from the dead and extending salvation to all mankind who have died in the past. It also commemorates the Judgment day which is to occur, to determine who is written in the book of life. At this time God will be all in all and the revealing of God’s plan as we know it will be complete (Revelation 20:11-13).