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

Other days

comfy

Comfy Day
eat what you want

Eat What You Want Day
reading

Reading Day
me

Me Day
gum

Gum Day
law

Law Day
one

One Day
singles

Singles Day
pampering

Pampering Day
slime

Slime Day