Mortal Engines Book Group Activity Help PLEASE?

So for my HS book group project we are reading the hungry city chronicles: mortal engines,by phillip reeve. And the thing is sometime between now and next thursday my group needs to come up with an activity to do..so far the running idea is a short skit, but, we are not sure what to do, and what scene would work with the amount of people we have in our book-group, four guys, one girl, if you have any other ideas of what we could do to present the book, please explain, (i suppose a poster would be a viable option as a last resort)....