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

Other days

first love

First Love Day
donate your hair

Donate Your Hair Day
azonto is acceptable

Azonto Is Acceptable Day
reading

Reading Day
self care

Self Care Day
one

One Day
law

Law Day
lisp

Lisp Day
gum

Gum Day
fiancee

Fiancee Day