Oops, it doesn't look like 'hiv vaccine awareness hiv vaccine awareness day' is a national day..

Other days

pumpkin

Pumpkin Day
prescription drug take back

Prescription Drug Take Back Day
polyamory

Polyamory Day
camera

Camera Day
cuddle up

Cuddle Up Day
bow tie

Bow Tie Day
gum

Gum Day
bounce

Bounce Day
cat girl

Cat Girl Day
kiss a ginger

Kiss A Ginger Day