Oops, it doesn't look like 'be petty on twitter day' is a national day..

Other days

girl friend

Girl Friend Day

polyamory

Polyamory Day

china

China Day

promposal

Promposal Day

Me Day

african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day

bow tie

Bow Tie Day

special education

Special Education Day

eat what you want

Eat What You Want Day

boyfriend

Boyfriend Day