Note 1 at Mt. 26:17: Matthew and Mark record the disciples approaching Jesus and asking Him where they should prepare the passover meal while Luke records Peter's and John's question (Luke 22:9) as being a response to Jesus' initiative.

To avoid any contradiction, the proper sequence must have been that some of Jesus' disciples asked Him the question first and Jesus responded by telling Peter and John to go and prepare the place. Then Peter and John asked where it was that He wanted them to prepare it.