For I received from the Lord what I also delivered to you, that the Lord Jesus on the night when he was betrayed took bread, And when he had given thanks, he broke it, and said, "This is my body which is for you. Do this in remembrance of me." In the same way also the cup, after supper, saying, "This cup is the new covenant in my blood. Do this, as often as 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 Corinthians 11:23-26This brings us to the logical, and morally sound, conclusion that celebrating a Seder Meal is not a practice that should be observed by Christians. We are the Easter People and Jesus is the Lamb of God. He is the New Covenant, the New Sacrifice, and His death saves us from Eternal damnation. No longer are we to offer animal sacrifices; the Temple has fallen, the biblical Jewish priests are gone, and Jesus has died for our Salvation.
If you'd like to delve further into this teaching please continue to Why Christians Shouldn't Celebrate Seder Meals. There you'll find references from Saint Thomas Aquinas, the Council of Trent, and Catholic theology books as well as an extremely informative audio presentation by a good holy priest.