Yes, I second Imp! Regarding both the lack of brain power and the Doctor's knowledge. Just an idea. I want to incorporate technology, and we could have a radio tuned in on the Wizarding Wireless Network. With that, our characters can hear what Wizarding Germany is like, and decide for themselves if they want to visit or not. It could play music, inform us on anything we want to know like disasters, political bs, laws, celebrity, random advertisements, etc.
Alright. Then I guess our first three posts will consist of: arriving at our rendezvous point, intermingling and (which would you guys like better, making a group decision or following a map?), and heading out to our first destination. Where ever that may be. For the sake of not slowing us down like last time, all of our characters should have already bought all of their necessities and necessary items.