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

Other days

cursing

Cursing Day
lumpy rug

Lumpy Rug Day
nail polish

Nail Polish Day
my little pony

My Little Pony Day
bow tie

Bow Tie Day
martini

Martini Day
ruby

Ruby Day
lisp

Lisp Day
boba

Boba Day
brow

Brow Day