I've done a search on Australia and laser shows - all i can find is a reference to AS standards documents-only for sale.
Posts here on PL give reference to: Projector having scanfail, emergency shutdown, emissions indicators etc, operator having a risk assessment and management plan, ability to calculate MPE, Public Liability (a must).
Perhaps Dave, tags or other aus forum members can answer what is legal in Aus.
Legal or not?
http://www.youtube.com/watch?v=qN26V2dwV1w
Venue area from stage across to back is approx 8 x 10 metres.