Oops, it doesn't look like 'army extends the original day' is a national day..

Other days

martini

Martini Day
stud

Stud Day
comfy

Comfy Day
ride the wind

Ride The Wind Day
kale

Kale Day
singles

Singles Day
ruby

Ruby Day
promposal

Promposal Day
bow tie

Bow Tie Day
coffee

Coffee Day