The 1st congress of the EAO took place in Leuven, Belgium, in 1992. It was followed the year after (1993) by Barcelona in Spain.
The following congresses were successively organised in
| Malmö, Sweden 1994 | |
| Dublin, Ireland 1995 | |
| Paris, France 1996 | |
| Berne, Switzerland 1997 | |
| Berlin, Germany 1998 | |
| Copenhagen, Denmark 1999 | |
| Amsterdam, Netherlands 2000 | |
| Milan, Italy 2001 | |
| Brussels, Belgium 2002 | |
| Vienna, Austria 2003 | |
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Paris, France 2004 |
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Munich, Germany 2005 |
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Zurich, Switzerland 2006 |
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Barcelona, Spain 2007 |
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Warsaw, Poland 2008 |
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Monaco, 2009 |
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Glasgow, 2010 |
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Athens, 2011 |
Join us to celebrate the EAO's 20th Anniversary at our next Congress in Copenhagen