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

Other days

lash

Lash Day
girl friend

Girl Friend Day
tell a fairytale

Tell A Fairytale Day
ruby

Ruby Day
hannah

Hannah Day
first love

First Love Day
martini

Martini Day
boba

Boba Day
boy friend

Boy Friend Day
gum

Gum Day