I would try asking members of the Melbourne meet-up if any of them had an interest to meet at either your house, their house, or at a chosen point in between at some point. There is a chance that you'll find out that some of them are less than 90 minutes away, and another chance some of them do not live less than 90 minutes away, but might have the time to make the drive over, particularly if you try to meet them at some sort of halfway point.