If you have a valid working with children check you can work in NSW for up to 30 days per calendar year.
-a worker who is working in and visiting New South Wales from outside the State for the purposes of child-related work (other than a worker referred to in paragraph (l) or (m)), if the worker is the holder of an interstate working with children check in the jurisdiction in which the person ordinarily resides, or is exempt from the requirement to have such a check in that jurisdiction, and the period of the child-related work in New South Wales does not exceed a total of 30 days in any calendar year,
-a worker who is working in and visiting New South Wales from outside the State for the purposes of a one-off event such as a jamboree, sporting or religious event or tour, if the event is the only child-related work carried out by the worker in New South Wales in that calendar year and the period of the work does not exceed 30 days
Victoria will also accept other States working with children checks for up to 30 days.
Click here for further info for VIC.
We will be chasing up the other States and Territories about their position, and will keep you posted.