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

Other days

offer

Offer Day
pampering

Pampering Day
bubble bath

Bubble Bath Day
law

Law Day
tulip

Tulip Day
kiss a ginger

Kiss A Ginger Day
boy friend

Boy Friend Day
fiancee

Fiancee Day
nail polish

Nail Polish Day
ruby

Ruby Day