Oops, it doesn't look like 'academy powder day' is a national day..

Other days

boba

Boba Day
tulip

Tulip Day
gum

Gum Day
ormille

Ormille Day
prosecco

Prosecco Day
ruby

Ruby Day
my little pony

My Little Pony Day
tell a fairytale

Tell A Fairytale Day
blanket fort

Blanket Fort Day
lumpy rug

Lumpy Rug Day