Preparation for the last supper

Mark 14:12a And the first day of unleavened bread, when they killed the passover [1], Matt 26:17a Now the first day of the feast of unleavened bread Luke 22:7 Then came the day of unleavened bread, when the passover must be killed.
Mark 14:12b his disciples said unto him, Where wilt thou that we go and prepare that thou mayest eat the passover? Matt 26:17b the disciples came to Jesus, saying unto him, Where wilt thou that we prepare for thee to eat the passover? Luke 22:8 And he sent Peter and John, saying, Go and prepare us the passover, that we may eat. 9 And they said unto him, Where wilt thou that we prepare?
Mark 14:13 And he sendeth forth two of his disciples, and saith unto them, Go ye into the city, and there shall meet you a man bearing a pitcher of water: follow him.   Luke 22:10 And he said unto them, Behold, when ye are entered into the city, there shall a man meet you, bearing a pitcher of water; follow him into the house where he entereth in.
Mark 14:14 And wheresoever he shall go in, say ye to the goodman of the house, The Master saith, Where is the guestchamber, where I shall eat the passover with my disciples? Matt 26:18 And he said, Go into the city to such a man, and say unto him, The Master saith, My time is at hand; I will keep the passover at thy house with my disciples. Luke 22:11 And ye shall say unto the goodman of the house, The Master saith unto thee, Where is the guestchamber, where I shall eat the passover with my disciples?
Mark 14:15 And he will shew you a large upper room furnished and prepared: there make ready for us.   Luke 22:12 And he shall shew you a large upper room furnished: there make ready.
Mark 14:16 And his disciples went forth, and came into the city, and found as he had said unto them: and they made ready the passover. Matt 26:19 And the disciples did as Jesus had appointed them; and they made ready the passover. Luke 22:13 And they went, and found as he had said unto them: and they made ready the passover.

[1]This is contradicted by John 13:1 and 19:14 which place Jesus with Pilate while the passover is still in preparation.