Oops, it doesn't look like 'piss you off day' is a national day..

Other days

self care

Self Care Day
cat girl

Cat Girl Day
bow tie

Bow Tie Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
boyfriend

Boyfriend Day
fiancee

Fiancee Day
artists

Artists Day
hiv awareness

Hiv Awareness Day
self appreciation

Self Appreciation Day
china

China Day