The Food Forest at Gawler are having an open day this Sunday April 15, here is the press release:

An incredible range of  fresh organic food will be available for tasting at an Open Day at The Food Forest permaculture farm and learning centre at Gawler on Sunday 15 April.
The property is home to some 150 varieties of fruit, nuts, vegetables and herbs and autumn is harvest time! Apart from freshly pressed apple juice and the perennially delicious pistachios, the unique flavour of the desert-dwelling jojoba bean and the extraordinary taste of carobs will remind the public that they are visiting one of Australia’s most amazing farms. The Food Forest uses a fraction of the water and the energy that normally goes into producing a kilo of food, basically through intelligent garden and farm design, which includes recycling water through reedbeds.
Another clever technique on display is building with straw bales; there will be a builder, an  architect and an engineer who specialize in straw bale construction to lead visitors around the display buildings which also feature solar hot water, photovoltaic power and passive solar design. 
Permaculture design, organic gardening, food self sufficiency and how to keep chooks in the suburbs, add to the smorgasbord of sustainable tricks on the 15 hectare urban farm.
Visitors will be able to meet the management team which was recognised in the Nature Foundation Awards as running  SA’s top small business for Environmental Responsibility and Leadership; this follows the Premier’s Food Award for Leadership through Sustainable Industry and the Organic Federation’s Best Organic Producer in Australia. 

The Open Day will be in two parts, with Strawbale Building Information from 10am sharp-1pm  ($15) and Permaculture talks and inspections from 2pm sharp –5pm ($10). Visitors can also purchase a full-day ticket ($20) and bring a picnic lunch. Children under 16 free. Organic produce will be for sale.
The address: Clifford Rd, Hillier. Phone 85 226450

I’ve been wanting to check it out for some time, so this sounds like the perfect opportunity.