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

Other days

unicorn

Unicorn Day
latina equal pay

Latina Equal Pay Day
bow tie

Bow Tie Day
buddy

Buddy Day
emoji

Emoji Day
kale

Kale Day
pick me

Pick Me Day
boy friend

Boy Friend Day
lisp

Lisp Day
my little pony

My Little Pony Day