Revenge of the Fifth
annually on May 5th (since 2012)
Yesterday the pun "May the fourth be with you" signalled that it was Star Wars Day. Today is Revenge of the Fifth, and the day is also based on another Star Wars pun, being named for Star Wars: Episode III–Revenge of the Sith. Since 2012, it has celebrated the Sith Lords and other villains of Star Wars. Some celebrate the Sith Lords on May sixth, because they think that date is a better play on the word sith, as only one letter needs to be added. But, many believe the date of the fifth should be kept, as the holiday then takes place on the date immediately after Star Wars Day.
How to Observe
Today you should be celebrating Sith Lords. Maybe you didn't get through your whole Star Wars movie marathon yesterday, so this gives you an excuse to keep watching. Since some people celebrate the Revenge of the Sixth as well, you could even let your movie marathon last three days. If you just watch one Star Wars film today, Revenge of the Sith would be most appropriate. Maybe you can act a little evil today too, and if anyone asks why you are doing so, just say "It's the Revenge of the Fifth!"