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

Other days

bow tie

Bow Tie Day
china

China Day
first love

First Love Day
buddy

Buddy Day
carpenters

Carpenters Day
pick me

Pick Me Day
tulip

Tulip Day
tell a fairytale

Tell A Fairytale Day
book

Book Day
self care

Self Care Day