Let me say this, and it comes from 30 years of being in that cult.
If you let your family go to meetings, and you passively sit by and just say it is ok to have your wife go, you are asking for more trouble than you can imagine. It will start out slow.
this is how they work, they will work slow but sure to get your wife totally subjugated to the society, when that is accomplished by studding mind numbing books, and going to meeting to show that she is not alone that the "group" is with her hence god is with her. when this is done, they move little by little to start having her stop birthdays, holidays, ect. Imagine you wife not going to or taking part in the kids birthday party, Halloween, Christmas ect. this will have a big effect on the children, then she will [if she stays in and in taken over by the cult] start to teach the kids, once your kids start to go, this is a 50/50 prop. but if they do go, you are and will be the obstructionist.
They will teach you kids and wife that your trying to keep ties to the "world" or keeping the kids form going to the meetings is Satan using you to keep them out of gods kingdom, and that she will need to fight with all her might to keep loyal to the org. they will tell her to honor you in all things not society related, but this amounts to if you want chicken or beef for dinner. society related things will be a big part of your life.
I am afraid that families that have one partner strong in the dubber cult, 9 out of 10 times get divorced or the family is in upheaval.
The cult demands much time and effort to keep a part of the cult, Now that said I have seen some that profess to be dubbers but do not keep close ties to the society, but they still keep apart from anything that has to do with the non org. people or activities.
Your wife going to meetings and joining is dangerous there is no doubt. the amount of danger depends much on your wife's ability to think for her self in the face of heavy mind control, the more she is inclined to follow the more danger for her and you,
IMO, you need to fight against it and hard, think of this as an invasion of your home, when someone breaks into your home, you don't sit there and wait till they are stabbing you, you fight with the most deadliest weapon you can grab from the first moment you are aware of the break in, will you are aware, fight, fight hard and now, the longer you wait the harder it is for you, and I am not talking physical, learn all the faults of the society, cause cognitive dissonance in your wife, don't let up till she sees the truth. you marriage depends on you now, if you don't you may as well get a book bag and start knocking on doors.