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

Other days

unicorn

Unicorn Day
bounce

Bounce Day
gum

Gum Day
nail polish

Nail Polish Day
cuddle up

Cuddle Up Day
blanket fort

Blanket Fort Day
frozen yogurt

Frozen Yogurt Day
hoodie

Hoodie Day
kale

Kale Day
latina equal pay

Latina Equal Pay Day