Commentaries:
What Luke is doing is showing the popular usage of the terminology, which is similar to what we do. Sometimes we call this season "Passover season," but at other times we refer to "the Days of Unleavened Bread," often implying the inclusion of Passover. We are probably less likely to do this than the Jews were because many of them blended the two days (Passover and the first day of Unleavened Bread). Luke is showing that the two terms were used in both ways. Sometimes "Passover" referred to the whole eight days, and sometimes "the Days of Unleavened Bread" identified the whole eight days.
John W. Ritenbaugh
The Night to be Much Observed
Other Forerunner Commentary entries containing Luke 22:1:
Exodus 12:6-20
Matthew 26:17-19