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

Other days

stress awareness

Stress Awareness Day

unicorn

Unicorn Day

nae nae

Nae Nae Day

youth

Youth Day

boyfriend

Boyfriend Day

stud

Stud Day

cursing

Cursing Day

ponytail

Ponytail Day

Me Day

chocolate milkshake

Chocolate Milkshake Day