Oops, it doesn't look like 'simp women day' is a national day..

Other days

youth

Youth Day
hoodie

Hoodie Day
nae nae

Nae Nae Day
ormille

Ormille Day
boy friend

Boy Friend Day
bonang

Bonang Day
polyamory

Polyamory Day
bubble bath

Bubble Bath Day
kiss a brunette

Kiss A Brunette Day
slime

Slime Day