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

Other days

lisp

Lisp Day
slime

Slime Day
cuddle up

Cuddle Up Day
pampering

Pampering Day
stud

Stud Day
bubble bath

Bubble Bath Day
lash

Lash Day
hannah

Hannah Day
cat girl

Cat Girl Day
china

China Day