round table vs symposium

round table

noun
  • A conference at which participants of similar status discuss and exchange views. 

  • A television show segment in which pundits or reporters discuss current events. 

  • Used other than figuratively or idiomatically: see round, table. 

symposium

noun
  • A conference or other meeting for discussion of a topic, especially one in which the participants make presentations. 

  • A drinking party in Ancient Greece, especially one with intellectual discussion. 

  • A collection of essays, articles or papers on a particular subject by a number of contributors. 

How often have the words round table and symposium occurred in a corpus of books? (source: Google Ngram Viewer )