Oops, it doesn't look like 'orang utan day' is a national day..

Other days

nae nae

Nae Nae Day
martini

Martini Day
first love

First Love Day
boy friend

Boy Friend Day
camera

Camera Day
nail polish

Nail Polish Day
lumpy rug

Lumpy Rug Day
aloxolt

Aloxolt Day
kale

Kale Day
gum

Gum Day