Oops, it doesn't look like 'pretend to be a time traveller day' is a national day..

Other days

Law Day

Tell Ur Crush You Like Them Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Cursing Day

Hot Chocolate Day

Pumpkin Day

Prescription Drug Take Back Day

Chocolate Milkshake Day

Boba Day

Kiss A Ginger Day