Oops, it doesn't look like 'butte pirate day' is a national day..

Other days

bow tie

Bow Tie Day
kale

Kale Day
stud

Stud Day
chocolate milkshake

Chocolate Milkshake Day
unicorn

Unicorn Day
blanket fort

Blanket Fort Day
slime

Slime Day
mean girls

Mean Girls Day
hannah

Hannah Day
prosecco

Prosecco Day