Oops, it doesn't look like 'Flag Hoisting day' is a national day..

Other days

nail polish

Nail Polish Day
cuddle up

Cuddle Up Day
pick me

Pick Me Day
donate your hair

Donate Your Hair Day
one

One Day
buddy

Buddy Day
hoodie

Hoodie Day
bonang

Bonang Day
bow tie

Bow Tie Day
nae nae

Nae Nae Day