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i'll write it down in my agenda , not sure if the wife needs to work, will it be a one day thing ?
and what time will it start ?

The same for me, but I will try to be there! Normally it's a one day thing, but everybody is free to stay longer, Aachen is a great city.
This time it started at 6 pm, guess it will be similar next time, but I'm not sure! :)