shrek day is dedicated to obviously shrek and it is June 4th

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.

Shrek day is where you celebrate shrek and it is on June 4th

on November 22 is national Shrek Day

August 21 is national Shrek day. You are obligated to watch the entirety of all the Shrek movies with the homies.