Oops, it doesn't look like 'facepalm meme stockpile will be exhausted by memorial day' is a national day..

Other days

Brow Day

Raise Awerness Of Zeus Day

Unicorn Day

Tell Ur Crush You Like Them Day

Chocolate Milkshake Day

Special Education Day

Nae Nae Day

Blanket Fort Day

Get Funky Day

First Love Day