Oops, it doesn't look like 'explosions in the sky day' is a national day..

Other days

tulip

Tulip Day
youth

Youth Day
first love

First Love Day
gum

Gum Day
one

One Day
bounce

Bounce Day
kiss a ginger

Kiss A Ginger Day
aloxolt

Aloxolt Day
camera

Camera Day
nae nae

Nae Nae Day