"Movie night" – General concept (e.g., "Let's have movie night!"). "A movie night" – Any one instance of a movie night (e.g., "We should plan a movie night."). "The movie night" – A specific movie night (e.g., "The movie night last Friday was fun.").

1. This is the name of the night. 2. This is one of many movie nights that we could talk about. 3. This is the only movie night relevant to our discussion, so you know exactly which one I mean.

It’s movie night tonight. When shall we next have a movie night? Did you enjoy the movie night we had last week?