- 2023 Organs across the Border
- 2022 Sydney Organ Weekend
- 2021 OHTA Online Conference
- 2020 – cancelled due to Covid pandemic
- 2019 Adelaide, South Australia
- 2018 Sydney, NSW
- 2017 Melbourne and Ballarat Regions, VIC
- 2016 New Zealand
- 2015 North of the Hunter, NSW
- 2014 Queensland
- 2013 South Australia
- 2012 Western Australia
- 2011 Tasmania
- 2010 New South Wales
- 2009 South Australia
- 2008 Victoria
- 2007 Queensland
- 2006 New Zealand
- 2005 Sydney & Hunter
- 2004 Western Australia
- 2003 Riverina
- 2002 Tasmania
- 2001 – Canberra and South-East New South Wales – Capital Organs
- 2000 – Melbourne – Melbourne Organ Weekend
- 1999 – Adelaide, Tanunda and the Fleurieu Peninsula
- 1998 – South East Queensland and Northern New South Wales – From Mountains to Coast
- 1997 – Melbourne – Australian Organists and Organ Music
- 1996 – New Zealand – Wellington and the South Island – Southern Sounds
- 1995 – Sydney – Restorations in Retrospect
- 1994 – Melbourne and the Western District of Victoria – Vintage Victoriana
- 1993 – Perth – West Australian Organs – The Old and the New
- 1992 – Launceston and Hobart – A Transplanted Tradition – Historical Organs of Tasmania
- 1991 – Adelaide and Moonta – A Broad Perspective
- 1990 – Katoomba, Bathurst, Carcoar, Mudgee, Muswellbrook, Singleton, Maitland & Newcastle
The Central West & Hunter, New South Wales
- 1989 – Brisbane, Ipswich & Gympie
- 1988 – Sydney – New South Wales – The State of Organ Preservation
- 1987 – Melbourne & the Victorian Goldfields
- 1986 – Adelaide – All the King’s Men
- 1985 – Melbourne & Bendigo
- 1984 – Sydney – Old and New: Some Notable Organs in Sydney and their design
- 1983 – Launceston – The 19th Century Sound Preserved – Tasmania’s Historic Pipe Organs
- 1982 – Melbourne – Conserving the Past – Pipe Organs in Victoria & New Zealand
- 1981 – Hunter Valley – Organs in the Hunter Valley, NSW
- 1980 – Adelaide – Colonial Enterprise in South Australian Organ Building
- 1979 – Sydney – Preserving a Nineteenth Centure Heritage
- 1978 – Melbourne – Pipe Organ Preservation Conference
