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

Other days

law

Law Day
bow tie

Bow Tie Day
mean girls

Mean Girls Day
buddy

Buddy Day
coffee

Coffee Day
blanket fort

Blanket Fort Day
raise awerness of zeus

Raise Awerness Of Zeus Day
frozen yogurt

Frozen Yogurt Day
believe

Believe Day
tulip

Tulip Day