| 16th Symposium | September 2024 |
Portugal |
| 15th Symposium | 17-25 August 2019 |
Germany, Berlin |
| 14th Symposium | 6-14 June 2015 |
Romania, Sibiu |
| 13th Symposium | 3 - 11 Sept. 2011 |
Denmark, Aalborg |
| 12th Symposium | 2 - 10 June 2007 |
Netherlands |
| 11th Symposium | 25 Sept - 2 Oct. 2004 |
Portugal |
| 10th Symposium | 16 - 24 Sept. 2000 |
USA, Stratford Hall |
| 9th Symposium | 2 - 9 Aug. 1997 |
Hungary, Budapest |
| 8th Symposium | 3 - 10 July 1993 |
Wales - GB, Aberystwyth |
| 7th Symposium | 13 - 18 Aug. 1989 |
Germany, Sankelmark |
| 6th Symposium | 14 - 20 July 1985 |
Belgium, Gent |
| 5th Symposium | 5 - 10 Apr. 1982 |
France, Claye-Souilly |
| 4th Symposium | 1 - 8 Sept. 1977 |
England - GB, Matlock |
| 3rd Symposium | 6 - 11 May 1973 |
Netherlands, Oosterbeek |
| 2nd Symposium | 12 - 17 May 1969 |
Denmark, Holte |
| 1st Symposium | 29 Sept. - 4 Oct. 1965 |
Portugal, Lisboa |
