[Organizers] Leading Contra Dances in non-english-speaking countries

Hi! I am in Germany and am new to event organizing. I have my first event planned for June. I have offered a few small workshops and family dances since November. An issue I have had with my smaller workshops (and am worried about my larger event) is language. With the smaller workshops, I just kinda wing it depending on who is there. But for a larger event, winging it is probably not the best tactic. I am wondering if there are a few other planners here that are not based in English-speaking countries and can share with me how things have worked out with for them. Do you stick to all English? or have the beginner lesson and/or walkthrus in the majority language? or everything except for the actual calling in the majority language? I am especially interested in the scenario of hiring a caller who doesn't speak German at all and curious if/how this will work out. Incidentally, the caller I have hired for my June event does speak German, so it won't be an issue. tia, Rebecca