both your premise and conjectures are laughable from a historical perspective. Scripture teaches that Christians assembled themselves on the 1st day of the week.
Christians gathered on every day of the week, when possible, as did the Jews.
Act_2:46 And they, continuing daily with one accord in the temple, and breaking bread from house to house, did eat their meat with gladness and singleness of heart,
Act_2:47 Praising God, and having favour with all the people. And the Lord added to the church daily such as should be saved.
Act_5:42 And daily in the temple, and in every house, they ceased not to teach and preach Jesus Christ.
Act_6:1 And in those days, when the number of the disciples was multiplied, there arose a murmuring of the Grecians against the Hebrews, because their widows were neglected in the daily ministration.
Act_16:5 And so were the churches established in the faith, and increased in number daily.
Act_17:11 These were more noble than those in Thessalonica, in that they received the word with all readiness of mind, and searched the scriptures daily, whether those things were so.
Act_19:9 But when divers were hardened, and believed not, but spake evil of that way before the multitude, he departed from them, and separated the disciples, disputing daily in the school of one Tyrannus.
Paul even preached daily:
Act_17:17 Therefore disputed he in the synagogue with the Jews, and with the devout persons, and in the market daily with them that met with him.
The first day of the week was no more special than any other of the six working days. Yet the sabbath, the 7th day, the Lord's day was always special, always gathered on and therein rested.
The body of believers may gather on any and every day with no injunction anywhere found in scripture against such, and in truth they met "daily", "continually", etc (Mat 26:55; Mar 14:49; Luk 22:53, 24:33,36; Acts 19:9) and likewise among the followers of Jesus Christ (Luk 24:51,53; Acts 1:3,9, 2:46-47, 5:42, 6:1, 16:5, 17:11,17; Heb 3:13, etc).
None of that extra gathering, is qualification of disobedience to (breaking) the Ten Commandments (Exodus 20:1-17), especially the 4th (Exodus 20:8-11) in its explicit command to "rest" and not "work" "the seventh day the sabbath of the LORD".
Just in the book of Acts alone, there are over 78 sabbaths explicitly recorded.
Acts 13:14,27,42,44, 15:21, 16:13, 17:2, 18:4, (20:6, 21:4, 28:14; Paul always waited seven days, so that he could keep the Sabbath with fellow Jews, and Proselytes (see Acts 2:10; 13:26,42-43,44,45-46,47-49, 14:1,2,15-16, 15:17,19,21, 17:17) and preach the gospel upon that sacred day (Acts 17:2), just as Jesus had; Luke 4:16-21).
John was still keeping the sabbath (of the LORD, the 7th day, "the Lord's day"; Revelation 1:10; Isaiah 58:13; just as Jesus had said so long before; Matthew 24:20) in AD 90+.
The references to "the first [day] of the week" are as follows:
Genesis 1:5 (Masoretes Hebrew) יום אחד׃ (Transliterated) yôm echäd f
Matthew 28:1(a) - (Koine Greek) οψε δε σαββατων (Transliterated) oye de sabbatwn
Matthew 28:1(b) - (Koine Greek) εις μιαν σαββατων (Transliterated) eiV mian sabbatwn
Mark 16:2 - (Koine Greek) και λιαν πρωι της μιας σαββατων (Transliterated) kai lian prwi ths mias sabbatwn
Mark 16:9 - (Koine Greek) αναστας δε πρωι πρωτη σαββατου (Transliterated) anastas de prwi prwth sabbatou
Luke 24:1 - (Koine Greek) τη δε μια των σαββατων (Transliterated) th de mia twn sabbatwn
(Matthew 28:1 (a,b); Mark 16:2,9; Luke 24:1 all refer to the same day, the 'first [day] of the week' just after Jesus arose from the tomb. This in effect makes it a single reference, just repeated about the one time (not weekly) yearly event as seen in Leviticus 23, Feast of Firstfruits. Yet even so, in the koine Greek every single 'first [day] of the week' text clearly shows that the first day is simply a number, with no special association or designation, other than it is simply one day toward the culmination of the week, being the 7th Day the Sabbath of the LORD thy God]:
Acts 20:7 - (Koine Greek) εν δε τη μια των σαββατων (Transliterated) en de th mia twn sabbatwn
(Acts 20:7, is a final farewell visit by Paul, who was going around "confirming the churches", and always preached on Sabbath (Acts 16:8,11, 20:5,6; 2 Corinthians 2:12; 2 Timothy 4:13), and in this instance, after Sabbath was complete, they met again and continued in fellowship and preaching, and had a final farewell. There is no evidence of a 'Lord's supper' here (no footwashing, basin, towel, fruit of the vine, cup, etc)). This special gathering, was held at night from after about 6pm to midnight, until morning (sunrise), to see Paul off. There is no repetition (cycle from week to week) of this event occurring in scripture, nor any weekly meeting established on the first [day] of the week here.
1 Corinthians 16:2 - (Koine Greek) κατα μιαν σαββατων (Transliterated) kata mian sabbatwn
(1 Corinthians 16:2 is a unique passage which refers to an extra or special and personally/individually gathered collection taken up privately (not even regular offering, nor tithe/firstfruits, nor even at a church or synagogue (but at one's own individual home), for the specific poor in a specific place, Jerusalem, for the dearth/famine; Acts 11:28; 1 Corinthians 16:3 that had been prophesied) after the sabbath was over, for Paul to pick up later when he came by.) There is no evidence of any 'service', 'Lord's supper' (and all that goes with it), gathering of the body of believers, scripture reading, prayer, etc here. It's all a private individual matter.
Acts 2:1, referring to Pentecost, which if calculated would fall upon "the first [day] of the week", based upon the
yearly (
not weekly, or monthly) festal calendar found in Leviticus 23. This event was then completely fulfilled as it states in Acts 2:16-21,33; Revelation 5:6; Psalms 133:1-3; &c. Even afterwards in Acts 2, it says that the disciples met "daily", in the "Temple", and even from "house to house" (vss 46-47).
These (following) references are to the second day of the week (John 20:1; context of Luke 24:13-36, already dark by the time of the upper room, which is another reason they did not recognize Jesus entering with the two other disciples from Emmaus, for He had walked back with them, unseen, and entered unseen, even as Jesus had done so with the two while walking before they had reached their own house. There is no teleporting, or ghosting through walls here. Jesus has a real body of flesh and bones (immortal)) and later (John 20:19) effectively and respectively (contextually, John 20:1 being a reference to a period of time after the sun had set, and the next reference (John 20:19) to after eight days beyond that):
John 20:1 - (Koine Greek) τη δε μια των σαββατων (Transliterated) th de mia twn sabbatwn
John 20:19 - (Koine Greek) τη μια των σαββατων (Transliterated) th mia twn sabbatwn