Revenge of the Fifth

Etymology
. From the name of the Star Wars movie  and a day of the month most similar sounding to "Sith".

Proper noun

 * 1)  The Fifth of May (May 5). The second Star Wars Day, the day after May the Fourth (May 4). Sometimes used to celebrate the Dark Side, when May 4 is used to celebrate the Jedi.

Usage notes
When May 5th is celebrated, then May 6th is not celebrated.