None of the biblical apostles did. Sunday worship was driven by the desire not to look Jewish to the Roman overlords. There were a series of Jewish revolts against the Roman empire beginning in 66 AD and ending in 135 AD. As a result Jews were hated by Rome and it became dangerous for early Christians to keep the biblical sabbaths. Those who stuck with the bible ended up dead or went into hiding. Those who wanted to hold on to their lives, wealth or social standing switched to Sunday and made up justifications for doing so.
They didn't. Read carefully, and understand Hebrew culture:
The Havdala service is an Hebrew custom to extend the joy of the Sabbath, and to usher in the new week. It happens at sundown after the Sabbath ends and is done often in home settings - It is the origin of 'pot luck', with everyone bringing a little something, gathering together to eat supper. Bread and wine feature prominently in the blessing before the meal, and speakers stand to preach during the dinner...
Re-read the NT with that understanding, and the whole thing changes.