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Let me ask you, what specifically do you mean by “wrong”, “celebrate” and “Passover”?
Wrong- religiously and morally incorrect.
Celebrate-to observe with thanksgiving and happiness
Passover-the festival established in the Old Testament whereby God's chosen, the Israelites, were spared the actions of the death angel due to the blood of a lamb being applied to the door post. Messianic Jews would likely draw a correlation to Christ being their passover lamb who forever freed them from the power of death through His blood.

Covenantally speaking, what the Bible identified as “Passover” ended 2000 year ago when the Antitype of Passover, Jesus Christ, the Lamb of God, appeared in human flesh to take away sins of His people.
Please show me where the festival of passover was 100% done away with. The specific feast or rite is what I am talking about. Show me in Scripture where it is forbidden or even discouraged that such a feast should occur.

I> Most Christians have no regard for Passover since they view it as part of the old covenant system that was temporary and fading away after the time of Christ.
Do not overestimate the number of folks who hold to your covenental theology. A HUGE number of evangelical Christians do not hold to covenant theology.

The priesthood, sacrifices, dietary laws, clothing laws, etc were all part of that older, temporary system.
The priesthood continues in the person of Christ and His children. Scripture indicates that in the future Israel will be reestablished with a priesthood intact. What they do will be more of a memorium to what Christ did. But, we haven't seen the last of the priestly system.

It is this last group that I have difficulty with since I cannot justify their actions from Scripture. They misunderstand the nature of the covenant, and see continuity were none exists in the Bible. They even go so far as to encourage non-Jews to participate in their ersatz ceremonies.
You have a disagreement with them on Scripture. It isn't that you can not understand where they are coming from. If their system of belief is true, then their actions are fully understandable.

The priesthood continues in the person of Christ and His children. Scripture indicates that in the future Israel will be reestablished with a priesthood intact. What they do will be more of a memorium to what Christ did. But, we haven't seen the last of the priestly system.

I'm just curious, have you ever read Hebrews and the distinction between the Levitical priesthood (of what the passover was part and which passed away 2000 years ago) and the better priesthood of Melchizedek of which Jesus is High Priest? Do you get the difference? Are you suggesting that Jesus and Christians today are Levites?

Can you point to any place in the Bible where God authorized His people to modify these temporary, old covenant rites associated with Passover to fit current conditions?

It seems that should answer your questions.