From Longman Business Dictionary
symposiumsym·po·si·um /sɪmˈpəʊziəm-ˈpoʊ-/ noun (plural symposiums or symposia /-ziə/) [countableC] a formal meeting in which people involved in a particular business or subject discuss itLondon will be the venue for the annual symposium.
symposium onThere will be a company-sponsored symposium on degradable plastic and the environment.