Hi Extreme Networks!
When a valid placename is specified a search is made for events taking place at venues within a certain radius of that place (and you can control the radius – making it larger or smaller as needed – via the event settings screens).
If you or a visitor provides the name of a large region or territory, then the geolocation API returns the coordinates for the centre-point of that area: the problem of course is that even with a large search radius, that will not necessarily cover the entire state of Queensland (or if it is a large enough radius, it may well pull in events in venues outside of Queensland, in adjacent states and territories).
This is an existing limitation of the system and not something for which there are any easy solutions, I’m afraid. Based on my description, though, do you think that is indeed the problem you are hitting?