Oops, it doesn't look like 'tear apart an elf day' is a national day..

Other days

promposal

Promposal Day
one

One Day
offer

Offer Day
ponytail

Ponytail Day
self appreciation

Self Appreciation Day
china

China Day
camera

Camera Day
bow tie

Bow Tie Day
my little pony

My Little Pony Day
book

Book Day