Oops, it doesn't look like 'i took a photo in yosemite once day' is a national day..

Other days

Get Funky Day

Cuddle Up Day

Raise Awerness Of Zeus Day

Lost Sock Memorial Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Polyamory Day

Bow Tie Day

Hoodie Day

Brow Day

Slime Day