I think you're confusing learning with memorization and/or indoctrination? If your lessions are only lecture, discussion, and reading then you can go ahead and skip them and replace them with nothing [1].

It's bunk that some students need lectures and other students need books, but these are only communication tools and they cannot learn knowledge from them.

[1] past the point where learning how to read/listen/discuss is itself the goal of the lesson