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

Other days

fiancee

Fiancee Day
buddy

Buddy Day
cursing

Cursing Day
boy friend

Boy Friend Day
unicorn

Unicorn Day
carpenters

Carpenters Day
blanket fort

Blanket Fort Day
girl friend

Girl Friend Day
tulip

Tulip Day
pampering

Pampering Day