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

Other days

lisp

Lisp Day
embarrass your best friend

Embarrass Your Best Friend Day
book

Book Day
reading

Reading Day
youth

Youth Day
tulip

Tulip Day
boy friend

Boy Friend Day
lumpy rug

Lumpy Rug Day
china

China Day
blanket fort

Blanket Fort Day