Just saw this thread. Interesting situation. Clearly, your wife sees that the building is just a building and is ok with having the lessons there. Since the recital isn't religious (just like the lessons) and not even sponsored by the church, playing in it would be no different than taking lessons. However, in JW world, appearances are EVERYTHING.
The real reason, BTW, is that if anyone in the congregation finds out, the nosy BOE will get involved and he'll have to probably quit even taking lessons there since it's a demon-infested, wild beast-ridin', church.
Yup, a BOE intent on making a big deal about something could have a field day with it.
I think that your plan of having your wife & son hash it out between them is perfect. I assume you've told them both that you're ok with it? So, now if your wife isn't, then she has to articulate the reasons why which as you brought out are not logical. You never know which straw will break the camels back and all these little things may open her eyes ever so slightly. I am positive they will open your son's eyes, especially if you aren't toeing the society line. I've starting doing this with my wife as well. I have no idea if it will ultimately work, but it seems like the best way.
Oh, I say this question:
have been any KHs that have rented out their buildings for secular purposes. Or how about the large facilities in NY? Large halls, apartments, whatever? If they rent them out on occasion, do they require all attendees of the event to listen to JW propaganda?
The answer is a big fat NO. The official line is that the KH is "dedicated to Jehovah for worship" and should not be used for any secular purposes whether by JWs or non-JWs. From a liability standpoint, it does open them up a bit more, especially since they are probably funding their "insurance" plan based on historical claim information which means JWs only and active JWs are very unlikely to sue the congregation for say a slip and fall. Plus, if they leased the buildings, it may put their non-profit status in jeopardy. And, we all know they generally don't want to provide any sort of outreach to the community.