It’s close to midnight on a Motzaei Shabbos, but the exuberant dancing in the hotel ballroom shows no sign of abating. Lively music is pumped through the loudspeakers as a large group of men join hands in a circle, together with the Rebbe of Radoshitz, Rav Aharon Yosef Horonchik. The men in the room, a cross section of Orthodox Jewry — chassidim, Litvaks, and Sephardim alike — are a circle of love and support, while on the other side of the mechitzah, their wives are soaking up the emotional fervor and inspiration of the evening.