Oops, it doesn't look like 'black air force day' is a national day..

Other days

gum

Gum Day
hannah

Hannah Day
pick me

Pick Me Day
lumpy rug

Lumpy Rug Day
lost sock memorial

Lost Sock Memorial Day
bounce

Bounce Day
boba

Boba Day
brow

Brow Day
polyamory

Polyamory Day
china

China Day