Luk 22:8 And he sent Peter and John, saying, Go and prepare us the passover, that we may eat.
snip
Luk 22:19 And he took bread, and gave thanks, and broke it, and gave unto them, saying, This is my body which is given for you: this do in remembrance of me.
The day of Jesus' resurrection was a glorious one indeed. The reason that many claim it was on the First Day of the week is to justify Sunday observance vice Sabbath. However, nowhere is it commanded in the Bible to switch the day of rest to Sunday. Of the 4 Gospel accounts of the resurrection, 3 say the tomb was "discovered empty" early on the the First Day of the week, and the 4th is subject to interpretation.
Here is the truth about the Easter Sunday observance from the source:
Q: What determines the date Easter Sunday falls on or when Lent begins?
A: The Council of Nicaea, in 325 A.D., determined that Easter should be celebrated the first Sunday after the first full moon of spring. To determine the beginning of Lent, count back six Sundays before Easter. The Wednesday before the first of these Sundays is Ash Wednesday.
It is a matter of where one decides to take one's theology.
I do not disagree with you, what I would add Christ became the Sabbath and it is in Him that we rest every day of the week.
No I am not saying it is wrong to go to church on Sunday or Saturday, just that the calendars have been altered so much by so many that realistically and/or legally speaking no man can with confidence say that our days of the week this day are the specific days of the week from Exodus when the law was given to keep the Sabbath.