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

Other days

brow

Brow Day
donate your hair

Donate Your Hair Day
tell a fairytale

Tell A Fairytale Day
fiancee

Fiancee Day
singles

Singles Day
offer

Offer Day
gum

Gum Day
bow tie

Bow Tie Day
cursing

Cursing Day
stud

Stud Day