Oops, it doesn't look like 'ice cream soda ice cream soda day' is a national day..

Other days

pick me

Pick Me Day
cat girl

Cat Girl Day
pumpkin

Pumpkin Day
buddy

Buddy Day
polyamory

Polyamory Day
youth

Youth Day
cuddle up

Cuddle Up Day
slime

Slime Day
gum

Gum Day
martini

Martini Day