Steel you are correct.  Perhaps those you are speaking to are Roman catholics and like with everything Roman catholic they get things all screwed up.  The last Passover meal the LORD shared with HIS apostles in the upper room, they were all seated.  And the Israelites did not even celebrate the Passover in the wilderness after they left Egypt UNTIL they entered the Promised Land.  The LORD gave them the dates for all the feasts but they didn't celebrate any of them until they entered the LAND of Promise.

Mr 9:38 (KJV) And John answered him, saying, Master, we saw one casting out devils in thy name, and he followeth not us: and we forbad him, because he followeth not us.
39 But Jesus said, Forbid him not: for there is no man which shall do a miracle in my name, that can lightly speak evil of me.
40 For he that is not against us is on our part.