The mushriks even said that they havnt seen any better shairi than Quran. So what was that. Why Allah liked the poetic way to describe its Quran.
its not totally a shairi mehfil and where u have seen people doing "wah wah" in milad mehfil. maybe some people do that. But normally people hear everything quitely.
'wah wah' was used as praising the person who is presenting the milad.
It can be by nodding head, saying mashallah or whatever. The essence of the sentence was they agree with whatever is said and then later business as usual. Like I mentioned earlier, I am very much familiar of these mehfils.