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

Other days

unicorn

Unicorn Day
ormille

Ormille Day
cuddle up

Cuddle Up Day
polyamory

Polyamory Day
boba

Boba Day
first love

First Love Day
stud

Stud Day
pampering

Pampering Day
tell a fairytale

Tell A Fairytale Day
reading

Reading Day