Oops, it doesn't look like 'deface columbus day' is a national day..

Other days

brow

Brow Day
aloxolt

Aloxolt Day
blanket fort

Blanket Fort Day
stud

Stud Day
boy friend

Boy Friend Day
gum

Gum Day
nae nae

Nae Nae Day
bonang

Bonang Day
martini

Martini Day
youth

Youth Day