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

Other days

brow

Brow Day
pumpkin

Pumpkin Day
prosecco

Prosecco Day
lash

Lash Day
self appreciation

Self Appreciation Day
believe

Believe Day
ask out your crush

Ask Out Your Crush Day
artists

Artists Day
martini

Martini Day
tulip

Tulip Day