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

Other days

tulip

Tulip Day
boyfriend

Boyfriend Day
ruby

Ruby Day
nail polish

Nail Polish Day
lisp

Lisp Day
artists

Artists Day
boba

Boba Day
bounce

Bounce Day
nae nae

Nae Nae Day
eat what you want

Eat What You Want Day