With the abstract booklet more information will be distributed.
If you want to start gathering information now there are a few things
which you might find useful.
Town of Hamburg
Weather conditions in Hamburg
Hamburg is famous for its weather - be it positive or negative.
Early May is a very good time to visit the area with warm spring
days. But keep in mind that it also can be pretty cold and rainy also.
So this information might help you a litte: English, Deutsch