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

Other days

ruby

Ruby Day
kiss a ginger

Kiss A Ginger Day
bonang

Bonang Day
cuddle up

Cuddle Up Day
slime

Slime Day
gum

Gum Day
self care

Self Care Day
gallery

Gallery Day
ponytail

Ponytail Day
frozen yogurt

Frozen Yogurt Day