Oops, it doesn't look like 'keep a secret to yourself day' is a national day..

Other days

self care

Self Care Day
bounce

Bounce Day
ruby

Ruby Day
singles

Singles Day
get funky

Get Funky Day
slime

Slime Day
gum

Gum Day
cat girl

Cat Girl Day
fiancee

Fiancee Day
hoodie

Hoodie Day