Since the foundation of the IDDRG in 1958 until 2002, IDDRG organized a Biennial Congress in every second year, which was open to all. This was a conventional open meeting, with wide publicity - call for papers, refereeing, poster sessions, technical visits, ladies' programme.

In 2003, the organisation of IDDRG was restructured. Since then, instead of Biennial Congresses and Working Group Meetings an Annual Conference is organised. This is reflected in the name of the events, too: the Biennial Congresses were numbered from the 1st Biennial Congress held in Paris in 1960 until the 22nd Biennial Congress held in Nagoya in 2002. The new Annual Conferences started in Bled in 2003 are denoted as IDDRG'2003, IDDRG'2004, etc.

Title Location Year Congress President
1st Biennial IDDRG Congress Paris, France 1960 Prof. C. Crussard
2nd Biennial IDDRG Congress Dusseldorf, Germany 1962 -
3rd Biennial IDDRG Congress London, England 1964 -
4th Biennial IDDRG Congress Liege, Belgium 1966 -
5th Biennial IDDRG Congress Turin, Italy 1968 Prof. O. Masi
6th Biennial IDDRG Congress Tokyo, Japan 1970 Prof. S. Fukui
7th Biennial IDDRG Congress Amsterdam, Netherlands 1972 Dr. Chr. Veerman
8th Biennial IDDRG Congress Goteborg, Sweden 1974 Prof. O. Svahn
9th Biennial IDDRG Congress Ann Arbor, USA 1976 Dr. S.P. Keeler
11th Biennial IDDRG Congress Metz, France 1980 Dr. G. Pomey
12th Biennial IDDRG Congress Santa Margherita, Italy 1982 Mr. P. Timossi
13th Biennial IDDRG Congress Melbourne, Australia 1984 Dr. I. Brammar
14th Biennial IDDRG Congress Cologne and Munich, Germany 1986 Dr. C. Schneider
15th Biennial IDDRG Congress Dearborn, USA/Toronto, Canada 1988 Dr. S. P. Keeler
16th Biennial IDDRG Congress Borlange & Goteborg, Sweden 1990 Dr. Y. Bergstrom
17th Biennial IDDRG Congress Shenyang and Beijing, China 1992 Prof. Shi Chanxu
18th Biennial IDDRG Congress Lisbon, Portugal 1994 Prof. M.B. Marques
19th Biennial IDDRG Congress Eger, Hungary 1996 Prof. Miklos Tisza
20th Biennial IDDRG Congress Genval, Belgium 1998 Mr. Evert Janssen
21st Biennial IDDRG Congress Michigan, USA 2000 Mr. Mark Smith
22nd Biennial IDDRG Congress Nagoya, Japan 2002 Prof. Hisashi Hayashi