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

Other days

martini

Martini Day
singles

Singles Day
ruby

Ruby Day
coffee

Coffee Day
lash

Lash Day
bow tie

Bow Tie Day
comfy

Comfy Day
eat what you want

Eat What You Want Day
china

China Day
my little pony

My Little Pony Day