▁the ▁Sydney ▁Har bour ▁Bridge ▁was ▁celebrated . ▁The ▁occasion ▁was ▁marked ▁with ▁a ▁rib bon - cut ting ▁ceremony ▁by ▁the ▁governor , ▁Marie ▁Bash ir ▁and ▁the ▁premier ▁of ▁New ▁South ▁Wales , ▁Morris ▁I em ma . ▁The ▁bridge ▁was ▁subsequently ▁open ▁to ▁the ▁public ▁to ▁walk ▁south ward ▁from ▁M ils ons ▁Point ▁or ▁North ▁Sydney . ▁Several ▁major ▁roads , ▁mainly ▁in ▁the ▁C BD , ▁were ▁closed ▁for ▁the ▁day . ▁An ▁Ab original ▁sm oking ▁ceremony ▁was ▁held ▁at ▁ 1 9 : 0 0 . ▁ ▁Appro xim ately ▁ 2 5 0 , 0 0 0 ▁people ▁( 5 0 , 0 0 0 ▁more ▁than ▁were ▁registered ) ▁took ▁part ▁in ▁the ▁event . ▁Bright ▁yellow ▁sou venir ▁caps ▁were ▁distributed ▁to ▁walk ers . ▁A ▁series ▁of ▁speak ers ▁placed ▁at ▁intervals ▁along ▁the ▁bridge ▁formed ▁a ▁sound ▁installation . ▁Each ▁group ▁of ▁speak ers ▁broadcast ▁sound ▁and ▁music ▁from ▁a ▁particular ▁era ▁( e . g . ▁King ▁Edward ▁VIII ' s ▁ab dic ation ▁speech ; ▁G ough ▁Whit lam ' s ▁speech ▁at ▁Parliament ▁House ▁in ▁ 1 9 7 5 ), ▁the ▁overall ▁effect ▁being ▁that ▁the ▁sounds cape ▁would ▁" flow " ▁through ▁history ▁as ▁walk ers ▁proceeded ▁along ▁the ▁bridge . ▁A ▁light - show ▁began ▁after ▁sun set ▁and ▁continued ▁late ▁into ▁the ▁night , ▁the ▁bridge ▁being ▁b athed ▁in ▁constantly ▁changing , ▁multi - col oured ▁light ing , ▁designed ▁to ▁highlight ▁struct