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

Other days

lisp

Lisp Day
book

Book Day
nae nae

Nae Nae Day
cursing

Cursing Day
raise awerness of zeus

Raise Awerness Of Zeus Day
special education

Special Education Day
ruby

Ruby Day
youth

Youth Day
slime

Slime Day
self care

Self Care Day