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

Other days

lumpy rug

Lumpy Rug Day
latina equal pay

Latina Equal Pay Day
law

Law Day
bounce

Bounce Day
carpenters

Carpenters Day
nail polish

Nail Polish Day
kale

Kale Day
artists

Artists Day
blanket fort

Blanket Fort Day
ruby

Ruby Day