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

Other days

prosecco

Prosecco Day
bounce

Bounce Day
one

One Day
stud

Stud Day
comfy

Comfy Day
mean girls

Mean Girls Day
ruby

Ruby Day
pick me

Pick Me Day
my little pony

My Little Pony Day
self care

Self Care Day