Oops, it doesn't look like 'flags this republic day' is a national day..

Other days

kale

Kale Day
ask out your crush

Ask Out Your Crush Day
hot chocolate

Hot Chocolate Day
bow tie

Bow Tie Day
cuddle up

Cuddle Up Day
stud

Stud Day
reading

Reading Day
offer

Offer Day
lisp

Lisp Day
lash

Lash Day