Information about the role and function of a COVID Marshal and who must have one can be found here:
We note that COVID Marshals are mandatory for indoor gyms and personal training facilities used by members of the public aged 19 and over.*
As the rules for physical recreation apply to dance schools and studios, dance schools and studios will need a COVID Marshal for activities that involve adults.
*…in Regional Victoria, so we presume this will include Melbourne with the easing of restrictions.
The COVID Marshal must undergo basic infection control awareness training. You can find this training at the Department of Health COVID-19 Infection Control Training page:
It is recommended that COVID Marshals are also trained in first aid (Level 2).