Symposium

Symposium
1. a conference or meeting to discuss a particular subject.

2.
a: a convivial party (as after a banquet in ancient Greece) with music and conversation
b: a social gathering at which there is free interchange of ideas

2
a: a formal meeting at which several specialists deliver short addresses on a topic or on related topics — compare colloquium
b: a collection of opinions on a subject; especially : one published by a periodical

Colloquiums
:a usually academic meeting at which specialists deliver addresses on a topic or on related topics and then answer questions relating to them

From Merriam-webster