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

Other days

bow tie

Bow Tie Day
donate your hair

Donate Your Hair Day
pumpkin

Pumpkin Day
brow

Brow Day
boba

Boba Day
offer

Offer Day
my little pony

My Little Pony Day
self care

Self Care Day
comfy

Comfy Day
bubble bath

Bubble Bath Day