Star Wars Day, May 4, celebrates Star Wars created by George Lucas. It is observed by fans of the films. Observance of the holiday spread quickly through Internet, social media, and grassroots celebrations.
The date was chosen for the easy pun on the catchphrase "May the Force be with you" as "May the Fourth be with you". Even though the holiday was not actually created or declared by Lucasfilm, many Star Wars fans across the world have chosen to celebrate the holiday.