conférencier invité

CONT: Il y a dans beaucoup de sessions de recyclage, des conférenciers extérieurs, invités à exposer leur savoir et leur expérience.

CONT: Workshop. ... An able guide is usually present to bring his experience and previous training to bear upon the problem. There may or may not be outside speakers.
CONT: Once an organisation has had the experience of one (or more) of these courses ... it is possible for further courses to be planned, administered and run from within, with or without the aid of outside speakers and at a minimum cost.