Oops, it doesn't look like 'julian hill stfu day' is a national day..

Other days

self care

Self Care Day
pick me

Pick Me Day
stud

Stud Day
cat girl

Cat Girl Day
unicorn

Unicorn Day
aloxolt

Aloxolt Day
lisp

Lisp Day
my little pony

My Little Pony Day
fiancee

Fiancee Day
book

Book Day