As the 'visiting author' during their book week I taught 9 classes in comic books over 2 days there. 7 classes to the younger kids (12/13/14 years old) in which I did a very short PPT intro to my books, then we spent most of the time on activities. In this case, I gave them 2 pages of art from our books, with the text whited out - and they had to come up with the speech balloons and caption text, working in pairs.
Then, with the use of a nice little pen type camera which the school had, we sent what they had done, panel by panel to the screen, and i read it out...of course they had done lots of silly and interesting stuff: comedy, horror, realistic and out right odd interpretations of what the story could be. The kids laughed a lot to see each others stuff.
I also did a class with the older students, 17 and 18. Along with a few members of staff they asked me some very good questions about graphic novels, the creative approach, problems that come up, and even got into contentious issues like how money holds back comics. I was very impressed by how eloquent and knowledgable the kids are at such international schools are. One 18 year old student asked me if there are any other writers that I would like to make a visual version of. I said, yes, Jorge Luis Borges - and not only did she know who he was, she even mentioned the title of one of his stories. Great stuff!
And I did a presentation to the whole school also (500 plus and all the staff), in a big lecture theatre. The students mostly organised this themselves, including an excellent video of my books they had made, and this TV show type question and answer session after my presentation.