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Madras, India, 7–11 January 1980
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Stockholm, Sweden, 6–8 February 1980
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Florence, Italy, 2–6 June 1980
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Naples, Italy, 2–6 June 1980
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Tokyo, Japan, 30 June–4 July 1980
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Basel, Switzerland, 2–4 July 1980
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Sydney, Australia, 7–11 July 1980
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Toulouse, France, 7–11 July 1980
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Seefeld, Austria, 13–19 July 1980
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Lancaster University, UK, 20–26 July 1980
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Cleveland, Ohio, USA, 10–15 August 1980
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Regensburg, Federal Republic of Germany, 11–15 August 1980
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Santa Cruz, California, USA, 17–22 August 1980
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Liverpool, UK, 3–5 September 1980
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Karlovy Vary, Czechoslovakia, 15–19 September 1980
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Brussels, Belgium, 16–19 September 1980
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Tenerife, Canary Islands, Spain, 21–27 September 1980
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Karlovy Vary, Czechoslovakia, 22–26 September 1980
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Dubna, USSR, 23–27 September 1980