This day is considered an unofficial holiday by Star Wars fans to celebrate Star Wars culture and remember the films.
May 4 is called Star Wars Day (also sometimes known as Luke Skywalker Day) because of the popularity of a common pun spoken on this day. Since the phrase “May the Force be with you” is a famous quote often spoken in the Star Wars films, fans commonly say "May the fourth be with you" on this day. It should be noted that Star Wars fans were not the first to introduce the line “May the Fourth Be With You”. When Margaret Thatcher was elected Britain's first female prime minister, it happened on the Fourth of May 1979. This led her party to place an advertisement in The London Evening News, which said: "May The Fourth Be With You, Maggie. Congratulations."