Fourth leg? Depends on who has daylight savings when.
I just spun the Kiwi and Aussie dates through timeanddate.com and got this.
Show start time - Local date, location = US eastern time equivalent - US eastern date equivalent
9pm - 17 March, Auckland = 3am - 17 March
9pm - 18 March, Auckland = 3am - 18 March
9pm - 21 March, Brisbane = 6am - 21 March
9pm - 24 March, Melbourne = 5am - 24 March
9pm - 25 March, Melbourne = 5am - 25 March
9pm - 28 March, Adelaide = 5:30am - 28 March
9pm - 31 March, Sydney = 5am - 31 March
9pm - 1 April, Sydney = 5am - 1 April