What does Luke 22:1 mean?

Luke often adds asides to provide context or material that doesn't warrant a larger exposition. Luke 21:37—22:2 is remarkably similar to Luke 19:47–48:

And he was teaching daily in the temple. The chief priests and the scribes and the principal men of the people were seeking to destroy him, but they did not find anything they could do, for all the people were hanging on his words.

Passover is a feast celebrating God's rescue of the Israelites from Egypt. The last plague God used to convince Pharaoh to let the Israelites go was the death of every firstborn son. The Israelites followed God's instruction to kill a lamb and paint their doorposts with the blood so their sons would be spared (Exodus 12:1–13, 21–32). God ordained that the Jews should repeat this meal once a year and added the weeklong Feast of Unleavened Bread to extend the memorial (Exodus 12:14–20). Because the two are strongly linked, both "Passover" and "Feast of Unleavened Bread" are used to refer to the entire eight-day event.

Luke says the "Feast of Unleavened Bread drew near." Mark specifies the Passover is two days away (Mark 14:1). The meeting includes the chief priests, scribes, and elders, and is held at Caiaphas's house (Matthew 26:3–5). Jesus will go to Bethany where a woman will anoint Him with oil (Matthew 26:6–13; Mark 14:3–9). After Judas has seen a "waste" of money for the second time in a week (John 12:1–8), he will go to the chief priests and coordinate his betrayal of Jesus (Luke 22:3–6).