In Luke 21, Jesus continues teaching daily in the temple.
It was now two days before the Passover and the Feast of Unleavened Bread. And the chief priests and the scribes were seeking how to arrest him by stealth and kill him, for they said, “Not during the feast, lest there be an uproar from the people.” – Mark 14:1-2
The chief priests were in a sense of urgency because of the Passover approaching in regards to seeking out a plot to arrest and kill Jesus.
And on the first day of Unleavened Bread, when they sacrificed the Passover lamb, his disciples said to him, “Where will you have us go and prepare for you to eat the Passover?” And he sent two of his disciples and said to them, “Go into the city, and a man carrying a jar of water will meet you. Follow him, and wherever he enters, say to the master of the house, ‘The Teacher says, Where is my guest room, where I may eat the Passover with my disciples?’ And he will show you a large upper room furnished and ready; there prepare for us.” And the disciples set out and went to the city and found it just as he had told them, and they prepared the Passover. – Mark 14:12-16
Jesus gives instructions to the disciples to find the guest room where they will prepare for the Passover and the Lord’s Supper.