Question: What do you think about Christians hosting a Passover Sedar?

Answer:  I am not Jewish, but as a Native American I have an opinion on appropriating spiritual and religious practices from historically oppressed groups who many be struggling to keep their own cultural traditions accurate and authentic - it's not right to "borrow" especially if someone is a member of the dominant culture and then has the ability/power to "frame" the oppressed group's experience.   Doing something jointly across cultures or participating in another culture's activities, when appropriate, is fine.