• Copenhagen (Denmark) 1951,
  • London (UK) 1952,
  • Zurich (Switzerland) 1953,
  • Rome (Italy) 1954,
  • Amsterdam (The?Netherlands) 1955,
  • Belgrade (Yugoslavia) 1956,
  • Copenhagen (Denmark) 1957,
  • Berlin (German DR) 1958,
  • Istanbul (Turkey) 1959,
  • Milan (Italy) 1960,
  • Jerusalem (Israel) 1961,
  • Madrid (Spain) 1962,
  • Oslo (Norway) 1963,
  • Gdansk (Poland) 1964,
  • Edinburgh (UK) 1965,
  • Athens (Greece) 1966,
  • Vienna (Austria) 1967,
  • Helsinki (Finland) 1968,
  • Jerusalem (Israel) 1969,
  • Berlin West (Germany FR) 1970,
  • Paris (France) 1971,
  • Bologna (Italy) 1972,
  • Singapore (Singapore) 1973,
  • Haifa (Israel) 1974,
  • Philadelphia, PA (USA) 1975,
  • Hong Kong 1976,
  • Snderborg (Denmark) 1977,
  • Matrei-Brenner (Austria) 1978,
  • Cairo (Egypt) 1980,
  • Katoomba (Australia) 1981,
  • Rohrschach (Switzerland) 1982,
  • Aquila (Italy) 1983,
  • Solbacka (Sweden) 1984,
  • Valkenburg (The Netherlands) 1985,
  • St Plten (Austria) 1986,
  • Belgrade (Yugoslavia) 1987,
  • Lagos (Nigeria) 1988,
  • Lisbon (Portugal) 1989,
  • Hradec Kralov (Czechoslovakia) 1990,
  • land (Finland) 1991;
  • Londrina (Brazil) 1992,
  • Snderborg (Denmark) 1993,
  • Skopje (Macedonia) 1994,
  • Barcelona (Spain) 1995,
  • Prague (Czech Rep) 1996,
  • Hurghada (Egypt) 1998,
  • Monterrey (Mexico) 1999,
  • Porto (Portugal) 2000,
  • lborg (Denmark) 2001;
  • Taipei (Taiwan, China) 2002,
  • Porlamar (Venezuela) 2004,
  • Ohrid (Macedonia) 2004,
  • Antalya (Turkey) March 2005,
  • Hurghada (Egypt) August 2005,
  • Pucn (Chile) March 2006,
  • Sokobanja (Serbia-Montenegro) August 2006,
  • Mandurah (Australia) March 2007,
  • Canterbury (UK) August 2007,
  • Monterrey (Mexico) March 2008,
  • Ocho Rios (Jamaica) August 2008,
  • Hammamet (Tunisia) March 2009,
  • Ohrid (Macedonia) August 2009,?
  • Bangkok (Thailand) March 2010,
  • Montral QC (Canada) August 2010,
  • Jakarta (Indonesia) March 2011,
  • Copenhagen¬†(Denmark) August 2011,
  • Accra (Ghana) March 2012,
  • Mumbai (India) August 2012,
  • Baltimore (USA) March 2013,
  • Santiago (Chile) August 2013,
  • Hammamet (Tunisia) March 2014,
  • Taipei (China,¬†Taiwan) August 2014,
  • Antalya (Turkey) March 2015,
  • Ohrid (Macedonia) August 2015,
  • St Paul’s Bay (Malta) March 2016,
  • Puebla (Mexico) August 2016