She has since returned on several occasions (a total of 15 official visits) and has officiated at such important moments as the bicentenary in 1970 of James Cook's voyage along the East Coast of Australia; the opening of the Sydney Opera House in 1973; her Silver Jubilee in 1977; proclamation of the Australia Act in 1986; various events commemorating the bicentenary of the arrival of First Fleet and the opening of the new Parliament House in Canberra in 1988; the centenary of federation in 2000; her Golden Jubilee in 2002; and more.