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

Other days

lisp

Lisp Day
believe

Believe Day
prescription drug take back

Prescription Drug Take Back Day
stress awareness

Stress Awareness Day
cuddle up

Cuddle Up Day
self appreciation

Self Appreciation Day
china

China Day
blanket fort

Blanket Fort Day
embarrass your best friend

Embarrass Your Best Friend Day
self care

Self Care Day