For more details:
http://www.smh.com.au/entertainment/whatson/
and....
http://www.pinhole.org
or an excerpt:
World Pinhole Photography Day
Fans of pinhole cameras can take their creations to Centennial Park for World Pinhole Photography Day. Or see photographs taken without a lens, using pinhole cameras made from biscuit tins, shoe boxes and drink cans. The results will be posted on http://www.pinholeday.org. Sun, from 1.30pm, meet at the Rose Garden near Dickens Drive, Centennial Park, pinholeday.org, 9405 2052