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

Other days

martini

Martini Day
bounce

Bounce Day
me

Me Day
boba

Boba Day
lumpy rug

Lumpy Rug Day
cuddle up

Cuddle Up Day
nae nae

Nae Nae Day
tulip

Tulip Day
boyfriend

Boyfriend Day
bow tie

Bow Tie Day