I think there is absolutely no need to stop, everyone has their own hobbies, just like men like to smoke and drink, women also like to sing and dance ah, this is not all people's basic rights? You can't just think about your own hobbies and not let your own wife have hobbies it's so unfair.
She just cares less about her family now, not that she doesn't care about them at all. And like the woman who attended the song, her age should be between fifty and sixty years old. Women at that age have grown children and don't need to supervise them all the time like children. She's got time on her hands now and is perfectly capable of doing what she likes, and I don't think it seems to make sense to stop letting people go and relax.
Nowadays, a lot of aunts in their fifties and sixties go to the square to dance, and they dance in the evening after dinner, so this kind of song will generally be on weekends and Sundays or in the evenings, and it's not possible to go to work all day long. So this time period your family should take care of also take care of, the rest are their own time, they have a little hobby to support.
The husband and wife should understand each other, can not be too selfish everything is standing in their own point of view, to wife completely for the family dedication. If you want your wife to do this, then you have to see if you have to do it, if you can't do it yourself, you can't ask others to do it.
Unless there is a situation where there is an elderly person in your family who needs to be taken care of, then in this case you can talk to your wife and let her fix the time to go to the singing club, but don't deprive her of her rights completely. Taking care of the elderly is very hard work and it might be too depressing if you don't go out and relax.
If there are no old people to take care of, then let her do what she likes, after all, she has given her whole life to the family. If it were me, I'd probably go to the concert with my wife, after all, singing can make you feel better. The two go together and there is a companion, but also can encourage each other how good ah.