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

Other days

ponytail

Ponytail Day

comfy

Comfy Day

prosecco

Prosecco Day

pick me

Pick Me Day

brow

Brow Day

cursing

Cursing Day

singles

Singles Day

Me Day

lost sock memorial

Lost Sock Memorial Day

stress awareness

Stress Awareness Day