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

Other days

promposal

Promposal Day
law

Law Day
tell ur crush you like them

Tell Ur Crush You Like Them Day
my little pony

My Little Pony Day
ask out your crush

Ask Out Your Crush Day
singles

Singles Day
me

Me Day
self care

Self Care Day
girl friend

Girl Friend Day
tell a fairytale

Tell A Fairytale Day