Yes, PMA's insurance covers the play experience, and all individuals that attend.
However, it is important to encourage all participants of your play experience to become Play Matters Australia members. This ensures that all families who attend play experiences supported by Play Matters Australia are registered and accounted for. This means that people attending and running play experiences are covered by the relevant insurances; and that there is a record of participation should there be any unforeseen incidents.
See these articles for further information on membership and recording families through the attendance system.