It is the day that Star Wars fans have unofficially announced holidays to commemorate the Star Wars culture and movie.
May 4 has become a phenomenon in the movie. (Also known as Luke Skywalker day.)
Star Wars Day is an unofficial celebration of Star Wars fans around the world on May 4. Today was chosen for a simple reason for Star Wars - " May the force be with you . - ." It is pronounced similarly ( May the fourth be with you ) due to the word game made about reading the line.
This statement was first congratulated in 1979 for the victory in the election of Prime Minister Margaret Thatcher (and more specifically, through a press release). May is a very related month with Star Wars - until 2005, the premiere of each episode took place in May (this tradition broke in 2015 on December 18, when the seventh episode premiered).