Look up profiles of over 50 international film festivals. As this is from an Australian screen site you can read about not only the festivals but also find out the Aussie films that have screened over the last 10 years. Don't be disappointed about that although they do have an impressive record - use it as an incentive to discover deadline and screening information, and links to each festival's official website to start entering your film!
Good Luck!
http://www.screenaustralia.gov.au/festivals/default.aspx