Oops, it doesn't look like 'flag of wales day' is a national day..

Other days

promposal

Promposal Day
cuddle up

Cuddle Up Day
ormille

Ormille Day
pick me

Pick Me Day
boy friend

Boy Friend Day
nail polish

Nail Polish Day
bow tie

Bow Tie Day
mean girls

Mean Girls Day
one

One Day
get funky

Get Funky Day