We had a seder at church last night. Yes Passover isn't until April, although Easter is in March. (The discrepancy is a roman vs. jewish calendar thing). It was interesting.
It was run by a handful of Messianic Jews who do this kind of thing on a regular basis. My mother is in a jewish/christian cross cultural class at my church which is also being taught by some different Messianic Jews. That wouldn't be remarkable except that her class was making dinner for the seder, so my gentile mother made potato kugel.
The class was good in that a lot of Baptists got a feel for what a real Jewish seder is like. That is important because to truly understand the last supper, you really need to know the seder. Even more importantly, communion/mass/whatever your denomination calls it is based on the 4th cup of wine at the seder. "Do this in remembrance of me" can takes a whole different meaning when you realize that Jesus was leading a Passover service at the time.