Definition: International congress
An international congress is that which meets the minimum participation level from other nations. This level is fixed at 40% representation from at least 3 different nations.
Within the international congress category, there are several possible further classifications. One of these concerns continentality:
Continental: Foreigners > 80% from one continent
World: Foreigners < 80% from one continent
Eurostat, "Methodological manual for statistics on congresses and conferences", Office for Official Publications of the European Communities, Luxembourg, 2000