Christians do not celebrate the passover. We celebrate the Lords' Supper on apostolic authority. That's what Paul called it after all. If he wanted to use the word "passover" to describe the gathering of baptized Jewish and gentile believers around the bread and wine, he would have done so.
Of course that would have been confusing, since God commanded that old covenant passover be celebrated by the shedding of the blood of animals. He also specified that uncircumcised gentiles were not allow to participate in the passover. (Speaking of Matt. 5:17,18, there is no command from God to allow uncircumcised gentiles to partake of the passover.)
So Paul was not so confused as modern judaistic worshippers, and he understood from the Lord Himself that what the church was doing was not a Jewish passover, but a Christian Lord's Supper, made universal and appropriate for people of all ethnic and cultural backgrounds.
"In the same way He took the cup also, after supper, saying, 'This cup is the new covenant in My blood; do this, as often as (gr. hosakis) you drink it, in remembrance of Me.' For as often as you eat this bread and drink the cup, you proclaim the Lord's death until He comes." (1 Cor. 11:25,26)
The practice of the early church was to do this frequently, certainly more often than once a year.
"And they continued steadfastly in the apostles' doctrine and fellowship, in the breaking of bread, and in prayers." (Acts 2:42)
"Now on the first day of the week, when the disciples came together to break bread, Paul, ready to depart the next day, spoke to them and continued his message until midnight." (Acts 20:7)
When Paul conducted the Lord's Supper in Acts 20, it was nowhere near the date of passover as far as we can tell.
"The cup of blessing which we bless, is it not the communion of the blood of Christ? The bread which we break, is it not the communion of the body of Christ?" (1 Cor. 10:16)
It was typical of the early church that whenever they came together to receive instruction from the apostles and elders, to engage in the Lord's Supper and prayer. This is the simple pattern of gospel worship.
Christ is our passover (1 Cor. 5:7). We no longer observe in the shadowy pracitces of the old covenant, since the reality of Christ's finished work and the new covenant as dawned. We live in the age of Messish, the "age to come". We have put off the older fleshly worship forms, and worship Christ anew in the simplicity of the gospel.
Sure they do. If you're not, then you're not honoring or obeying God by observing his passover, one of the days he commandmended his followers to observe:
Lev 23:5 In the fourteenth day of the first month at even is the LORD's passover.
You're also disoboeying God in the flesh, Jesus Christ, and not following the practice that he did:
Luk 22:8 And he sent Peter and John, saying, Go and prepare us the passover, that we may eat.
Mar 14:16 And his disciples went forth, and came into the city, and found as he had said unto them: and they made ready the passove
You're also not following the example of Paul, who said emphatically to keep the passover:
1Co 5:7 Purge out therefore the old leaven, that ye may be a new lump, as ye are unleavened. For even Christ our passover is sacrificed for us:
1Co 5:8 Therefore let us keep the feast, not with old leaven, neither with the leaven of malice and wickedness; but with the unleavened bread of sincerity and truth.
We celebrate the Lords' Supper on apostolic authority. That's what Paul called it after all.
You should be taking the Lord's supper on the day that the Lord instituted his supper and the day he himself took it, Passover.
Of course that would have been confusing, since God commanded that old covenant passover be celebrated by the shedding of the blood of animals. He also specified that uncircumcised gentiles were not allow to participate in the passover. (Speaking of Matt. 5:17,18, there is no command from God to allow uncircumcised gentiles to partake of the passover.)
Again, you're confused about this because you don't understand Hebrews or the covenants. Study study study.
The practice of the early church was to do this frequently, certainly more often than once a year.
"And they continued steadfastly in the apostles' doctrine and fellowship, in the breaking of bread, and in prayers." (Acts 2:42)
The phrase "to break bread" can and often does mean to eat a meal and not always to eat the Lord's supper. For example:
Act 27:34 Wherefore I pray you to take some meat: for this is for your health: for there shall not an hair fall from the head of any of you.
Act 27:35 And when he had thus spoken, he took bread, and gave thanks to God in presence of them all: and when he had broken it, he began to eat.
Act 27:36 Then were they all of good cheer, and they also took some meat.
Not the Lord's supper, but the breaking of a fast.
"Now on the first day of the week, when the disciples came together to break bread, Paul, ready to depart the next day, spoke to them and continued his message until midnight." (Acts 20:7)
When Paul conducted the Lord's Supper in Acts 20, it was nowhere near the date of passover as far as we can tell.
Ummmm...does it say that they ate the "Lord's Supper"...or does it say that they broke bread? It says that they came together for a meal (on what we would call Saturday night),after the sabbath. This is a common jewish practice and a common practice of many sabbatarian churches. For proof of this:
Act 20:8 And there were many lights in the upper chamber, where they were gathered together.
Act 20:9 And there sat in a window a certain young man named Eutychus, being fallen into a deep sleep: and as Paul was long preaching, he sunk down with sleep, and fell down from the third loft, and was taken up dead.
Act 20:10 And Paul went down, and fell on him, and embracing him said, Trouble not yourselves; for his life is in him.
Act 20:11 When he therefore was come up again, and had broken bread, and eaten, and talked a long while, even till break of day, so he departed.
The young man broke bread, he ate, to get his strength back. There is no church service on Sunday here. It's merely a tortured attempt to justify sabbath breaking. It's fellowshipping, sharing a meal, following the sabbath. The point of the story was to point out the miraculous incident of Paul bringing the young man back to life, not to prove some mythical church service.