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

Other days

singles

Singles Day

cursing

Cursing Day

polyamory

Polyamory Day

lost sock memorial

Lost Sock Memorial Day

healing

Healing Day

boy friend

Boy Friend Day

stress awareness

Stress Awareness Day

stud

Stud Day

boyfriend

Boyfriend Day

african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day