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

Other days

camera

Camera Day
gallery

Gallery Day
girl friend

Girl Friend Day
nae nae

Nae Nae Day
cursing

Cursing Day
stud

Stud Day
ormille

Ormille Day
youth

Youth Day
bow tie

Bow Tie Day
cuddle up

Cuddle Up Day