The Mitteler Rebbe's kapelia had chassidic musicians and chassidic horse riders, who would enliven occasions. The Rebbe's son, Reb Nachum, was a horse rider.
One ordinary day, the Rebbe called for a performance. Reb Nachum was flung from his horse and was badly hurt but the Rebbe motioned that the performance should continue. A doctor examined him, concluding, "he has only broken his leg."
Chassidim asked the Rebbe why he had ordered that the performance continue, despite the accident. "Why don't you ask the reason for calling for a performance on a regular day?" responded the Rebbe. "I became aware of a harsh decree being issued in Heaven on my son, and since joy sweetens stern decrees, I called for the kapelia. The joy helped, for his fall turned out much less harmful than what had been planned for him. Then, to ensure a complete recovery, I instructed that the festivities continue. With Hashem's help, he will recover completely."
