There was a regular day between Passover, and the regular weekly sabbath, the 6th day of the week separated them.
Ezekiel 46:1
“’This is what the Sovereign LORD says: The gate of the inner court facing east is to be shut on the six working days, but on the Sabbath day and on the day of the New Moon it is to be opened.
How do we get two Sabbaths with what our Sovereign says to Ezekiel above?
Day 1.New moon day
Day 2-7. 6 work days
Day 8. Seventh day Sabbath
Now the Gregorian calendar certainly disregards scriptures like this and can certainly provde postponements and cancellation opportunities for people to do the same..