What I can confirm is that at the arabic assemblies in Germany, individuals took drums or other insturments and they started playing music during the break, with lots of brothers and sisters participating in singing. It was not as part of the official program, however is was quite huge.
I guess in Germany they have some more traditions. A lot of the preaching has been street witnessing instead of house-to-house, even before the carts. Just standing on the street for hours and counting time.
They have so many old brothers and sisters too. So things are very well over there