International Firefighters' Day (IFFD) is observed annually on May 4. It was created in 1999 to honor the memory of five firefighters who died in a wildfire in Australia.
Every May 4 many people around the world take on pink shirts to show their support of Anti-Bullying Day. This event was started in 2012 and it's already known in 25 countries around the world.
Star Wars Day is an informal observance celebrated by fans of the Star Wars franchise created by George Lucas. It is held annually on May 4.