Knowingly Joining or Continuing In an Unlawful Assembly is an offence under Section 545C of the Crimes Act 1900 which carries a maximum penalty of 6 months in prison.
To establish the offence, the prosecution must prove beyond reasonable doubt that:
Assemblies include protests, demonstrations and processions.
They are public if they are conducted on a public road, public reserve or any other place which the public are entitled to use.
An assembly is unlawful unless it complies with the provisions of Part 4 of the Summary Offences Act 1988 which sets out a range of rules and requirements which must be complied with before a proposed assembly can be regarded as lawful.