1) Academic conference 2) Conference 1) Class 
[n] - an academic meeting or seminar usually led by a different lecturer and on a different topic at each meeting 2. [n] - an address to an academic meeting or seminar
colloquium (s) 1. A conversation, dialogue, colloquy. 2. A meeting or an assembly for discussions; a conference, a council; specifically, an academic conference. 3. An academic conference or seminar in which a particular topic is discussed, often with guest speakers.
noun an address to an academic meeting or seminar
a conference at which scholars or other experts present papers on, analyze, and discuss a specific topic.