Oops, it doesn't look like 'flag on r day' is a national day..

Other days

law

Law Day
cursing

Cursing Day
ormille

Ormille Day
self appreciation

Self Appreciation Day
lash

Lash Day
artists

Artists Day
cuddle up

Cuddle Up Day
eat what you want

Eat What You Want Day
buddy

Buddy Day
slime

Slime Day