Should Christians celebrate Passover or any of the other Jewish holidays?

Yeshua observed the biblical holidays during his earthly life. In addition, the apostle Paul exhorted the Corinthian Christians to celebrate the seder (1 Corinthians 5:8). The biblical feasts were given to teach, in a practical way, more about the nature of G-d and his plan for mankind. For example, Passover is rich in the symbolism of the Messiah's death, burial, and resurrection.

For more detailed information, see "God's Appointed Times: A Practical Guide for Understanding and Celebrating the Biblical Holidays" and the "Messianic Passover Haggadah". These materials provide a first-hand experience of the Jewish Passover, as Yeshua and his followers celebrated it.