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

Other days

bounce

Bounce Day
gum

Gum Day
lisp

Lisp Day
promposal

Promposal Day
buddy

Buddy Day
ponytail

Ponytail Day
lash

Lash Day
youth

Youth Day
kiss a ginger

Kiss A Ginger Day
bow tie

Bow Tie Day