In Melbourne , future Australian music superstars Powderfinger played Participation on the back of a flatbed truck for a crowd of approximately 40 people .

The main stage was originally constructed Building from three large flatbed trucks , and a common misperception is that this is where the name of the festival Social_event comes from .

Set GetReady up in the Pecan Grove campground , the informal stage began Process_start in 1987 when camper Russell Brace and friends built Building it on the back of a flatbed truck .