Just like Pre-class Activities, a Class In-charge can attach In-class activities with their lecture. In-class activities can be created by the Class In-charge anytime before or during the lecture but they can be published only when the lecture has been started (the lecture is In-session).
The idea of In-class activities is to increase student activity during a lecture. An in-class poll, for example, can be a good way to measure to students' understanding of a topic being discussed during a lecture.
In-class activities allow for Pop quizzes, discussions in which each student can participate and essential topic related resources that can be shared during a lecture.