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

Other days

unicorn

Unicorn Day
self care

Self Care Day
hoodie

Hoodie Day
eat what you want

Eat What You Want Day
self appreciation

Self Appreciation Day
nail polish

Nail Polish Day
lost sock memorial

Lost Sock Memorial Day
boy friend

Boy Friend Day
tell a fairytale

Tell A Fairytale Day
offer

Offer Day