All GIFs Day is a project of the League for Programming Freedom. According to Mike Macey of the Brisbane police department, setting stuff on fire on the sidewalk is illegal in Brisbane.
Smoking is legal there though.
The meeting point will be on the public trail facing Pier 5 of the the Brisbane Marina, near Unisys. The Unisys building and the nearby buildings and parking lots are private property. Do not trespass. Stay on the public trail. The Brisbane Marina facilities are used for very important nautical activities by the people of Brisbane.