 Kọ itẹsiwaju fun paragirafi yii - Roberts jẹ Mayor ti Sydney ni ọdun 1879, ọdun ti Ifihan International, fun eyiti o jẹ ọmọ ẹgbẹ ti Igbimọ New South Wales, bakannaa ti Awọn Igbimọ fun awọn ifihan ti o waye ni Melbourne ni ọdun 1880 : , Amsterdam ni 1883, Calcutta ni 1883-4, London Colonial and Indian ni 1886, ati Centennial ni 1888. 