I've never heard of the Feast of the Seven Fishes before. The recipes must be amazing, particularly if it is like the Italian equivalent of Thanksgiving.
It seems like a really good idea, actually, as there is so much fish symbolism in the bible. Many of the disciples were fishermen, for example.
I wonder if the number seven comes from the five loaves and two fish that Jesus multiplied at one point to feed the 5000?
Sometimes people just seem to pick a number and go with that though.