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

Other days

fiancee

Fiancee Day
slime

Slime Day
kiss a ginger

Kiss A Ginger Day
me

Me Day
cuddle up

Cuddle Up Day
tell a fairytale

Tell A Fairytale Day
one

One Day
mean girls

Mean Girls Day
bow tie

Bow Tie Day
coffee

Coffee Day