Oops, it doesn't look like 'simp for harry styles day' is a national day..

Other days

fiancee

Fiancee Day
self care

Self Care Day
ormille

Ormille Day
first love

First Love Day
buddy

Buddy Day
stud

Stud Day
boy friend

Boy Friend Day
aloxolt

Aloxolt Day
bounce

Bounce Day
bow tie

Bow Tie Day