The original musical 'Grease' by Jim Jacobs and Warren Casey is first produced in Chicago, marking the beginning of its journey before becoming a film.
The musical 'Grease' officially opens on Broadway, becoming a hit and establishing its popularity.
Principal photography for the movie 'Grease' starts, directed by Randal Kleiser.
The movie 'Grease', starring John Travolta and Olivia Newton-John, is released in theaters worldwide and becomes a cultural phenomenon.