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

Other days

ormille

Ormille Day
promposal

Promposal Day
fiancee

Fiancee Day
azonto is acceptable

Azonto Is Acceptable Day
cat girl

Cat Girl Day
bow tie

Bow Tie Day
ruby

Ruby Day
offer

Offer Day
ponytail

Ponytail Day
boy friend

Boy Friend Day