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

Other days

Nail Polish Day

Appreciate Yaself A Lil Extra Day

Pampering Day

Singles Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Lumpy Rug Day

Martini Day

Raise Awerness Of Zeus Day

Kiss A Ginger Day

Special Education Day