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

Other days

unicorn

Unicorn Day
fiancee

Fiancee Day
pumpkin

Pumpkin Day
cursing

Cursing Day
boy friend

Boy Friend Day
slime

Slime Day
raise awerness of zeus

Raise Awerness Of Zeus Day
ormille

Ormille Day
first love

First Love Day
comfy

Comfy Day