7 Then came the day of Unleavened Bread, on which the Passover lamb had to be sacrificed. 8 So Jesus sent Peter and John, saying, “Go and prepare the Passover for us, that we may eat it.” 9 They said to him, “Where will you have us prepare it?” 10 He said to them, “Behold, when you have entered the city, a man carrying a jar of water will meet you. Follow him into the house that he enters 11 and tell the master of the house, ‘The Teacher says to you, Where is the guest room, where I may eat the Passover with my disciples?’ 12 And he will show you a large upper room furnished; prepare it there.” 13 And they went and found it just as he had told them, and they prepared the Passover. (Luke 22:7-13)
The Passover had to be prepared. This meant having a lamb slaughtered at the temple, and then cooked in total. The whole thing had to be eaten, so the whole thing needed to be eaten. Jesus gives the disciples directions that are similar to those he gave the disciples getting the donkey for his triumphant entry. The room is already reserved for Jesus and his disciples. This will be the last one he celebrates with them. Later that day he will fulfill it. Yes, the Passover too was a prophecy that needed to be fulfilled.