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

Other days

aloxolt

Aloxolt Day
self care

Self Care Day
boba

Boba Day
martini

Martini Day
fiancee

Fiancee Day
self appreciation

Self Appreciation Day
polyamory

Polyamory Day
lisp

Lisp Day
slime

Slime Day
first love

First Love Day