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

Other days

fiancee

Fiancee Day
blanket fort

Blanket Fort Day
coffee

Coffee Day
gum

Gum Day
get funky

Get Funky Day
one

One Day
ormille

Ormille Day
boy friend

Boy Friend Day
unicorn

Unicorn Day
first love

First Love Day