Oops, it doesn't look like 'wwii museum solemnly joins with the entire world in commemorating international holocaust remembrance day' is a national day..

Other days

Martini Day

Tell Ur Crush You Like Them Day

Lumpy Rug Day

Bow Tie Day

Polyamory Day

Raise Awerness Of Zeus Day

Get Funky Day

Pick Me Day

Self Care Day

Bonang Day