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

Other days

nail polish

Nail Polish Day

martini

Martini Day

ruby

Ruby Day

bow tie

Bow Tie Day

stress awareness

Stress Awareness Day

book

Book Day

unicorn

Unicorn Day

hiv awareness

Hiv Awareness Day

pumpkin

Pumpkin Day

african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day