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

Other days

self care

Self Care Day
gallery

Gallery Day
singles

Singles Day
pick me

Pick Me Day
slime

Slime Day
lisp

Lisp Day
china

China Day
eat what you want

Eat What You Want Day
my little pony

My Little Pony Day
get funky

Get Funky Day