Question:
Tonight, a young boy became Bar Mitzvah and after Night Seder, the Chevra started dancing with him, while wishing him Mazal Tov. Is the dancing permitted during the three weeks?
Answer:
Although dancing is prohibited during the three weeks there is a dispute regarding dancing at a seudas mitzvah.
Sources:
O:CH 551 Eliyohu Rabah 26, ibid Mishnah Berurah 16, Teshuvas Mishnah Halochos 6:109, Orchos Rabenu 2:128.