There are no hard-and-fast rules about the preparation of the Feast of the Seven Fishes. But there is plenty of debate over its origin and how to celebrate this Italian and Italian-American tradition. What fish should be included and how they should be prepared can vary. Some people cook seven courses; some choose to make 12 (in deference to the 12 apostles). Some just put a bunch of seafood in a stew and call it good. Many families keep their own traditions, but everyone who celebrates can agree: Seafood should be prepared and consumed on Christmas Eve. Preferably with wine.
Here is a video of the Feast of the Seven Fishes from the Today Show on December 20th, 2016