The first night of Passover will never again coincide with the Thursday evening before the Sabbath before Christian Easter, or to put it another way, with Christians’ Maundy Thursday as narrated in the synoptic gospels of Matthew, Mark, and Luke. This is for historical and calendrical reasons, explained here. This year, however, the second night of Passover, which is celebrated in the diaspora, will. It’s a rare event, not to say precisely how rare.