We’re on day three of the Feast of Unleavened bread, by the way. We have another High Sabbath coming up on sundown of Friday April 22, through sundown of Saturday April 23.
This also happens to fall on a regular Sabbath this year.
Public potlucks and the proverbial macaroni salad were a big thing in ancient Israel.
That’s why the priests said “Let us not kill him on the feast day, lest the people riot.”
It’s because the day after Passover was a big public block party potluck. Everybody would have been in the streets for the feast.
That’s why the morning of the Passover is called “preparation day” in the gospels. It’s literally the day that you prepare all the food that the people are going to eat the next day because you can’t prepare it after sundown. Think of making food in advance for a Fourth of July party.
The last day of the festival week is a more solemn one. It’s a High Sabbath to look back on the events of the Passover week. It doesn’t mention a feast, just that you shouldn’t work.
And on the seventh day ye shall have an holy convocation; ye shall do no servile work.