Oops, it doesn't look like 'defense issue of our day' is a national day..

Other days

promposal

Promposal Day
blanket fort

Blanket Fort Day
pampering

Pampering Day
reading

Reading Day
boba

Boba Day
singles

Singles Day
bow tie

Bow Tie Day
kale

Kale Day
brow

Brow Day
ruby

Ruby Day