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

Other days

gallery

Gallery Day
bubble bath

Bubble Bath Day
cat girl

Cat Girl Day
pampering

Pampering Day
bow tie

Bow Tie Day
kale

Kale Day
slime

Slime Day
book

Book Day
comfy

Comfy Day
kiss a ginger

Kiss A Ginger Day