In our house we have a big meal on both days. My boyfriend is Puerto Rican, so I prepare a traditional Noche Buena feast with Pernil, Arroz con Gandules, pasteles (from his mom), etc on Christmas Eve. On Christmas Day, we have a more traditional American (ok, British) holiday dinner with goose, lamb, or beef. I try to spread out the cooking and prep for both meals over several days to minimize the time spent in the kitchen on the actual holidays. We always end up with tons of leftovers, but that is the best part!