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

Other days

hoodie

Hoodie Day
ponytail

Ponytail Day
get funky

Get Funky Day
boba

Boba Day
cursing

Cursing Day
tulip

Tulip Day
stud

Stud Day
kiss a ginger

Kiss A Ginger Day
boy friend

Boy Friend Day
china

China Day