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

Other days

first love

First Love Day
ask out your crush

Ask Out Your Crush Day
promposal

Promposal Day
get funky

Get Funky Day
pampering

Pampering Day
slime

Slime Day
lash

Lash Day
lisp

Lisp Day
gum

Gum Day
blanket fort

Blanket Fort Day