Oops, it doesn't look like 'cat on head day' is a national day..

Other days

slime

Slime Day
hot chocolate

Hot Chocolate Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
hiv awareness

Hiv Awareness Day
ruby

Ruby Day
lisp

Lisp Day
china

China Day
boy friend

Boy Friend Day
believe

Believe Day
ask out your crush

Ask Out Your Crush Day