How and when do departments decide who is teaching which course?
I am a graduate student at a state school in the U.S. The process has never seemed clear to me, as it seems that when none of the faculty particularly want to teach a course, sometimes graduate students are asked if they want to teach them.
I ask because I really like to teach courses, and want to ask if I can teach a 300-level undergraduate course, but I want to know the best time to do it.