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

Other days

pumpkin

Pumpkin Day
bow tie

Bow Tie Day
boba

Boba Day
kale

Kale Day
coffee

Coffee Day
buddy

Buddy Day
embarrass your best friend

Embarrass Your Best Friend Day
kiss a ginger

Kiss A Ginger Day
lash

Lash Day
self care

Self Care Day