Oops, it doesn't look like 'take your flask to works day' is a national day..

Other days

Azonto Is Acceptable Day

Frozen Yogurt Day

Pampering Day

Boba Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Lumpy Rug Day

Polyamory Day

Kiss A Ginger Day

Lost Sock Memorial Day

Reading Day