Europe

1981 World Nutrition Day

1981 The 200th Anniversary of the Edict of Toleration

1981 The 100th Anniversary of Hans Kelsen

1981 The 16th International Congress on Byzantine Studies

1981 The 75th Anniversary of “Südost-Messe Graz” Trade Fair

1981 The 500th Anniversary of the Gothic Winged Altar of St. Wolfgang

1981 The 10th International Congress of Mathematics in Innsbruck

1981 The 100th Anniversary of Otto Bauer

1981 World Congress of Fédération Internationale Pharmaceutique

1981 The 75th Anniversary of the Death of Ludwig Boltzmann