Since 1980 this event has been held in Goolwa, once a thriving river port. So one can expect paddle steamers, vintage wooden boats, steam launches, music and entertainment of all kinds on three separate sound stages. Quite a blowout. The website is at: http://www.woodenboatfestival.com.au
and will have an on-line schedule of eventss and map as the event nears. Since you're in the area you might get a chance to visit Rod Muller at Strath Steam http://www.strathsteam.com/
which is located in Goolwa.