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

Other days

cuddle up

Cuddle Up Day
coffee

Coffee Day
nail polish

Nail Polish Day
pumpkin

Pumpkin Day
girl friend

Girl Friend Day
pick me

Pick Me Day
law

Law Day
get funky

Get Funky Day
singles

Singles Day
prosecco

Prosecco Day