Aug 1 London's Regent's Canal opens Aug 7 1st potatoes planted in Hawaii Aug 14 1st US eye hospital, the NY Eye Infirmary, opens in NYC Aug 24 Constitutionalist insurrection at Oporto, Portugal; see Portugal's crises of the Nineteenth Century. Jul 1820 Historical Events by Year Sep 1820 Famous People Who Were Admirals Aviators Gangsters Generals Industrialists Suffragists