Oops, it doesn't look like 'Course Beautiful day' is a national day..

Other days

bonang

Bonang Day
lash

Lash Day
kiss a ginger

Kiss A Ginger Day
promposal

Promposal Day
cat girl

Cat Girl Day
slime

Slime Day
youth

Youth Day
kale

Kale Day
my little pony

My Little Pony Day
bubble bath

Bubble Bath Day