Oops, it doesn't look like 'hate on lance day' is a national day..

Other days

gum

Gum Day
believe

Believe Day
unicorn

Unicorn Day
healing

Healing Day
cursing

Cursing Day
hoodie

Hoodie Day
bow tie

Bow Tie Day
my little pony

My Little Pony Day
pick me

Pick Me Day
first love

First Love Day