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

Other days

book

Book Day
self appreciation

Self Appreciation Day
frozen yogurt

Frozen Yogurt Day
bounce

Bounce Day
bow tie

Bow Tie Day
pampering

Pampering Day
lash

Lash Day
my little pony

My Little Pony Day
slime

Slime Day
ruby

Ruby Day