Generally pretty good article. This is spot on.
However, most churches today don't actually observe the feast of Passover and Unleavened bread as Jesus Christ himself did in the pages of the bible. It's also evident that since Christ partook of the wine and bread on Passover and that Passover is a yearly observance that he intended his followers to do the same.
Paul said "Let us keep the feast". The feast was Passover and Unleavened Bread.
[Lev 23:4 KJV] - These [are] the feasts of the LORD, [even] holy convocations, which ye shall proclaim in their seasons.
[Lev 23:5 KJV] - In the fourteenth [day] of the first month at even [is] the LORD'S passover.
[Lev 23:6 KJV] - And on the fifteenth day of the same month [is] the feast of unleavened bread unto the LORD: seven days ye must eat unleavened bread.
These are the Lord Jesus Christ's days.
Things are rarely evident, when it comes to Scripture, or to life in general, IMHO.
I think the usual reading of "They devoted themselves to the Apostles' teaching and fellowship, to the breaking of bread and the prayers." is generally thought to refer to celebrating the Eucharist. I would say that those who want to assert that the Mass should only be celebrated on 14 Nissan would want to explain how in fewer than 100 years that notion was lost, and how, once lost, it was recovered by the Jehovah's Witnesses and others 1800 years (give or take) later.
as often as you shall eat this bread, and drink the chalice, you shall shew the death of the Lord, until he come (1 Cor 11:26)St. Paul did not subscribe to the yearly Communion idea.