Let us begin by asking why people attend lectures. Maybe you just need some place to go on weekday mornings. Maybe your friends show up at lectures. Maybe you want to learn some material. The point here is I want to emphasize learning , rather than teaching .
Teaching is about a talking head presenting more or less coherent notions on a topic.
Teaching may or may not facilitate learning. I want to emphasize learning. Some people learn a great deal from lectures, especially if they already have some background in the area. Those of us who are lucky enough to learn from lectures ought to plan on attending them. Maybe you'll learn something about insect physiology.