The unofficial holiday originated from a catchphrase from George Lucas’ first film of the space franchise, “Star Wars: A New Hope,” which was released in 1977. In the film, General Dodonna utters the phrase to the rebel alliance as they prepare for their assault on the Death Star.
“Then man your ships! And may the Force be with you!” Fans celebrate Star Wars Day on ‘May the 4th’ because it sounds similar to the classic catchphrase, “May the force be with you.”
learn more about the holiday here- star wars day 2023 – Search (bing.com)