Charmian Lawson (left), husband-to-be Tony and Sally Jane Willams, at the Lawley House Ball in 1968. Picture supplied Can you imagine? The equivalent of a gala ball at the Canberra Centre. (Although remember when Diner en Blanc was rained out, in 2014, and patrons were bussed from Rond Terrace to the Canberra Centre to have…