Desc: The Mushroom Evolution Concert: With Ol '55, Meo 245, Bill Miller and the Great Blokes, Kevin Borich. One of the most significant events in the history of Michael Gudinski's Mushroom Records was the ambitious Mushroom Evolution Concert, held on the Australia Day weekend of 1982, to celebrate the label's 10th anniversary. 100,000 people gathered at the Sidney Myer Music Bowl in Melbourne, over a remarkable two days.