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>> “Wasn’t the Sabbath done away with at the cross?” <<
Where would anyone get that absurd idea? The Acts is all about the keeping of the Sabbath and appointed feasts.
>> “The Apostles met on other days. They met on the first day of the week frequently.” <<
Fail!!!
When the Apostles met “on the first day of the week” it was right at sundown on what we call Saturday evening. It was always to gather monetary gifts that were forbidden to carry on the Sabbath, and it often then evolved into a late night study of the scriptures called “Havdalah.”
They never gathered on “Sunday.”
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That IS Sunday by Jewish time reckoning.
Never?