"The advanced training is tomorrow."
Translation:Die Weiterbildung ist morgen.
I agree, I think the preferred answer should be: "Die Ausbildung für Fortgeschrittene ist morgen". There is no ambiguity there.
While "Weiterbildung" can be translated to "advanced training", It also translates to "further training" or "continuing education", and as someone who has taken several continuing education courses, I would cringe at anyone calling that "advanced training"!