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

Other days

cursing

Cursing Day

unicorn

Unicorn Day

chocolate milkshake

Chocolate Milkshake Day

bubble bath

Bubble Bath Day

azonto is acceptable

Azonto Is Acceptable Day

slime

Slime Day

bow tie

Bow Tie Day

camera

Camera Day

boba

Boba Day

ride the wind

Ride The Wind Day