Here is an accessible look at the events of Holy Week. When was the “Last Supper” and was it a Seder? When was Jesus tried, condemned, and crucified? Let Jonathan Klawans guide your exploration:
Many people assume that Jesus’ Last Supper was a Seder, a ritual meal held in celebration of the Jewish holiday of Passover. And indeed, according to the Gospel of Mark 14:12, Jesus prepared for the Last Supper on the “first day of Unleavened Bread, when they sacrificed the Passover lamb.” If Jesus and his disciples gathered together to eat soon after the Passover lamb was sacrificed, what else could they possibly have eaten if not the Passover meal? And if they ate the Passover sacrifice, they must have held a Seder. […]
… I believe we must be careful not to let our emotions get the better of us when we are searching for history. Indeed, even though the association of the Last Supper with a Passover Seder remains entrenched in the popular mind, a growing number of scholars are beginning to express serious doubts about this claim.
Read the entire post on the pages of the Biblical Archeology Society:
Was Jesus’ Last Supper a Seder? – Biblical Archaeology Society.