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

Other days

boba

Boba Day
unicorn

Unicorn Day
gum

Gum Day
boyfriend

Boyfriend Day
lumpy rug

Lumpy Rug Day
cuddle up

Cuddle Up Day
blanket fort

Blanket Fort Day
singles

Singles Day
hiv awareness

Hiv Awareness Day
healing

Healing Day