Houses are open from 10-4 pm and are free. Just look out for the balloons.
You get to have a look at how different houses are rigging up solar panels, harvesting water, recycling, gardening and many more things. Lots of info to be had, and a good opportunity to find out what is happening in your sustainable living community.
Anyone in the Sydney area that is interested in having a look, a list here of all the houses.