You may have heard of the 'Feast Of The Seven Fishes' which is a traditional Italian dinner served on Christmas Eve. Well, it's more of a tradition here in the New Jersey/New York/Philly area than it is in Italy for the most part.
It was a tradition started hundreds of years ago in coastal towns around Rome and Naples on the Mediterranean Sea. Outside of that area, it's really not a thing, unless you live in our area.