Oops, it doesn't look like 'sea monkeys day' is a national day..

Other days

book

Book Day
promposal

Promposal Day
bow tie

Bow Tie Day
lash

Lash Day
prosecco

Prosecco Day
ride the wind

Ride The Wind Day
china

China Day
brow

Brow Day
kiss a brunette

Kiss A Brunette Day
kiss a ginger

Kiss A Ginger Day