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

Other days

bounce

Bounce Day
my little pony

My Little Pony Day
reading

Reading Day
eat what you want

Eat What You Want Day
martini

Martini Day
donate your hair

Donate Your Hair Day
kale

Kale Day
one

One Day
self care

Self Care Day
slime

Slime Day