I found the church meeting in London to be pretty interesting. I think it's remarkabel that the pastor or speaker can keep his train of thought amidst all of the "amens" and "hallelujas". Can you imagine what would happen if that's what we did in class every time the prof said something of value? I'd be willing to bet they'd have a really hard time giving a concrete lecture and we as students would have an even harder time refocusing after someone gives a hearty "teach it prof!".
The setting of our speech situation is a classroom. The participants in the speech situation are poor, top ramen eating college students. Most of us grew up in Salt Lake and are fairly accustomed to all the formalities of a class room setting. The other participant is a younger, semi-formal (...kinda) professor. The intended purpose is for the students to gain an understanding of the subject. The sequence of actions generally goes as such: at students are chatting are doing homework from another class until around 9:30 when the professor addresses the class and starts lecturing. When this happens we figure that class has begun and focus our attention on her. She lectures, we take notes. Most of the time during class we break up into groups and discuss the topic for the day. When that time is up we again focus our attention on the professor as she keeps on lecturing or, if the time for class is almost up, explains an assignment to do for next time. The mood is fairly light and interactive. We are free to ask questions and even joke around with the professor. The medium that the speech is occuring is through people. The social norms surrounding this event are as follows: don't talk when the prof is talking unless called on for a response, follow instructions, if we break up into groups discuss the topic assigned, when the prof addresses the class take that as a sign that the class has begun and focus on her, the prof dismisses the students and that can be before the expected time or after depending. The genre of the speech event is a lecture/discussion in a classroom setting.
Something I found interesting in analyzing our speech setting is that a lot of the learning done in class comes from breaking off into groups and discussing the topic with our peers rather than solely through the teacher lecturing. When this happens we could easily talk about whatever's on our minds, having nothing to do with topic on hand, but the social norms surrounding this discussion time keep us on track. Most of the time we're afraid to break these norms and talk about something different for fear that our peers will get angry or think we're stupid and have nothing of value to say.