To 147. Look at Igros Moshe, Orach Chaim chelek bais siman 95 towards the end, paragraph beginning with “U’bdvar haekudin”. It seems to be clear that music and dancing with participation by all is permitted throughout Sheva Brachos even after Rosh chodesh for wedding before rosh chodesh and after Lag B’omer for weddings on Lag B’omer. I have not seen anyone who does this but Rav Moshe zatzal seems to imply that it is the norm in such instances.
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