If that is the case....why would third and fourth generation Christians....well into the second century be celebrating Passover? After all.....they were disciples and descendants of disciples of the last living Apostle....John.
Maybe.....John didn't get the word??????
I think we would both agree that the early disciples were not keeping a biblical passover because they were not strictly following the code set forth in the old covenant.
I'm sure that some of these disciples were doing so for purely traditions sake, but the practices died out within a few generations.
But it also true that most of the groups that continued to push these old covenant practices, like the Ebionties, were heretical in much of their theology.
The fact remains that biblical passover ended when the temple was destroyed and the Levitical priesthood came to a close, and we see nothing in the NT to suggest that the Church expected to continue keeping it as a religious ceremony.