I hope the person doing the recording let the people know it is an offence to not do this, this is for NSW but I am sure all states are similar.
<span class=”ILfuVd”><span class=”e24Kjd”>In <b>New South Wales</b>, the Surveillance Devices Act 2007 prohibits the recording of audio conversations <b>without</b> the <b>consent</b> of all parties unless it is reasonably necessary for the purpose of protecting the lawful interests of the party who records the conversation.</span></span>