| 16th Symposium | 21 - 26 September 2024 | Portugal, Ponte de Sor & Valongo |
| 15th Symposium | 17 - 25 August 2019 | Germany, Berlin |
| 14th Symposium | 6 - 14 June 2015 | Romania, Sibiu |
| 13th Symposium | 3 - 11 September 2011 | Denmark, Aalborg |
| 12th Symposium | 2 - 10 June 2007 | Netherlands, Putten |
| 11th Symposium | 25 Sept - 2 Oct. 2004 | Portugal |
| 10th Symposium | 16 - 24 September 2000 | USA, Stratford Hall |
| 9th Symposium | 2 - 9 August 1997 | Hungary, Budapest |
| 8th Symposium | 3 - 10 July 1993 | Wales, Aberystwyth |
| 7th Symposium | 13 - 18 August 1989 | Germany, Sankelmark |
| 6th Symposium | 14 - 20 July 1985 | Belgium, Gent |
| 5th Symposium | 5 - 10 April 1982 | France, Claye-Souilly |
| 4th Symposium | 1 - 8 September 1977 | England, 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 |