They left and found things just as Jesus had told them

Luke 22:1-13
Judas went to the chief priests and the officers of the Temple guard and discussed with them how he might betray Jesus. They were delighted and agree to give him money.
Then came the day of Unleavened Bread on which the Passover lamb had to be sacrificed. Jesus sent Peter and John, saying, "Go and make preparations for us to eat the Passover."
Where do you want us to prepare for it? They left and found things just as Jesus had told them. So they prepared the Passover.
Why?
Judas betray Jesus with money and his heart was trapped by evil.
Passover is near so Jesus asked his disciples to prepare the Passover. Jesus knew the place and what person they will meet. Jesus knew the time and place for each moment. For Jesus is the Son of God.
Passover lamb had to be sacrificed is Jesus prepared to be sacrificed.
There is seven days before Passover to eat unleavened bread.
Jesus was follower of Jesus but he did not repent and his life did not be saved. So each Christian or people in the church does means he is real Jesus' follower, real Christian.
How?
Jesus is the Lord, who knows everything, who knows the places and timing. To be a Christian is the grace of God. Pray to the Lord!