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

Other days

boyfriend

Boyfriend Day
first love

First Love Day
lisp

Lisp Day
offer

Offer Day
donate your hair

Donate Your Hair Day
boba

Boba Day
gum

Gum Day
girl friend

Girl Friend Day
brow

Brow Day
stud

Stud Day