I got to go to my first ever passover dinner. A Japanese woman I know married a Jewish American man and invited me to their home for Passover. She made this dish called Ikura Matzoh Brae which combines Japanese and Jewish tastes. It was surprisingly tasty. Ikura goes very well with scrambled eggs.
Passover is a long meal where you talk about stories of Jewish history and each thing you eat has some kind of significance. At one point someone hides a piece of matzoh and the others have to find it. I think this is called the Abbie Hoffman. According to Wikipedia , Abbie Hoffman is the author of "Steal this Book" and also "Hide this Matzoh". He was born in 1936 so this must be a recent tradition.