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

Other days

boy friend

Boy Friend Day
coffee

Coffee Day
hoodie

Hoodie Day
cuddle up

Cuddle Up Day
lisp

Lisp Day
believe

Believe Day
boba

Boba Day
stud

Stud Day
cursing

Cursing Day
bow tie

Bow Tie Day