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

Other days

carpenters

Carpenters Day
cuddle up

Cuddle Up Day
stud

Stud Day
bow tie

Bow Tie Day
eat what you want

Eat What You Want Day
tulip

Tulip Day
ormille

Ormille Day
frozen yogurt

Frozen Yogurt Day
coffee

Coffee Day
slime

Slime Day