Perhaps, but that's what it is. Synonymously one could call it the New Testament Passover, but the actions of Jesus that night before He went out into the gardem clearly showed that He had to change the way the Passover was observed because animal sacrifices would no longer be needed for instruction or the foreshadowing of the Messiah. The Lamb of God was there and He would soon be sacrificed.
Or perhaps the "Lord's Supper" is a watered down version of what actually was practiced by the New Testament church. I mean you no offense in describing it as watered down, but the elements and certainly the specific day are certainly missing in most christian churches. I was there earlier in my life, I remember.
And that is where many stumble over this day and it's meaning. But, this is not a Jewish day and one does not have to keep the "Jewish" tradition to understand it's meaning. It is an appointed time which has taken on the meaning of each successive event that has occurred on this day. First (at least from what we have recorded) Abraham kept this day and it showed on thing, then Israel (which included the Jews) kept it and it became known for another reason, now lastly we have the most important fulfillment of all: the death of the Messiah.
I disagree. "The Lord's Supper" is only mentioned one time and it's not in a good light:
1Cor 11:20. When ye come together therefore into one place [to keep the Memorial], this is not to eat the Lord's supper. 21. For in eating every one taketh before other his own supper: and one is hungry, and another is drunken. 22. What? have ye not houses to eat and to drink in? or despise ye the church of God, and shame them that have not? What shall I say to you? shall I praise you in this? I praise you not.
It can be shown that Paul taught the Gentile churches to keep God's Holy Days and the Passover and Days of unleavened Bread are mentioned. Why would they be a point of reference for people who had never kept them if they weren't now keeping them after conversion?
I just asked a few people what the Lord's Supper is. No one even came close to mentioning it was the memorial of Christ's death. I think it was intentionally called that in order to counter the command to "keep the Lord's death 'till He come" (1 Cor 11:26) and substitute it with a day that celebrates "the resurrection" (on the wrong day) and when there was no command to commemorate the event at all.
Grace and Peace to you