Hi
I'd always thought that the Last Supper would have been on Wednesday, before the Passover, because the word used for
bread is ἄρτος (artos, meaning loaf, from αἴρω [airoh] to rise up, to carry what's raised, to bear away) instead of
bread as ἄζυμος (azymos, meaning bread without leavening), indicating that the feast was not yet in progress. Also, the people who seek to capture Jesus say that the capture
shouldn't be on the feast day for fear of agitating the people. (Around Matthew 26, 6)
Having a Passover Sabbath, then a weekly Sabbath (Sabbath meaning enforced rest)
would not be too unusual as the start of the week-long festival of the Passover is a set date, and not a, "second weekend in Nisan," kind of thing.
[eta] On the decade-long calender provided, a Thursday Pesach occurs 60% of the time, and never on a Friday. [/eta]
That would line up with all the buying and preparation of ointments and spices on the day before the weekly Sabbath, then a timely application to the corpse on Sunday morning, giving Thursday night, Friday day and night Saturday day and night, then Sunday morning as the third day after the third night.
On the other hand, I hadn't thought much about it, until you asked. Thanks for an interesting question.
There's an interesting (well - to me, anyhow) discussion of the pros and cons of the event being on a
Wednesday, Thursday or Friday at
Doig's Biblical Chronology.
...and a well thought out and supported page for a
Friday crucifixion, as well.