Great idea - our garden is very much smaller, just tiny, but we open up for charity each August, along with three other gardens in our immediate neighbourhool - it is a good way to help charities and is a very happy and friendly day.... both for us and for our visitors....we have a scheme in Scotland called Scotland's Garden Scheme, which publishes a book of gardens open under their scheme for charity each year .... perhaps there is a similar scheme in Australia?