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

Other days

tulip

Tulip Day
aloxolt

Aloxolt Day
fiancee

Fiancee Day
lash

Lash Day
kiss a brunette

Kiss A Brunette Day
unicorn

Unicorn Day
lisp

Lisp Day
kiss a ginger

Kiss A Ginger Day
nail polish

Nail Polish Day
law

Law Day