BC, that's great news! Get signed up and let her know when it is, make sure she understands that it's a Friday evening through Sunday afternoon commitment (you will never leave the hotel during that time). Make arrangements for someone to watch the kids. Basically take care of everything yourself. If W starts asking questions about what will happen just explain to her that there is little info available because they want you to come in as a "blank slate" with no preconceptions. Do tell her that you're not required to talk to anyone the whole weekend (a lot of WASs are freaked out that they may have to share their story). The hosts will share their stories with the group and will describe the exercises, then you will go to your room together to do the exercises. The only time I talked to anyone was at mealtime and it was just general chatting stuff with some of the other couples.
You'll understand afterwards, but all I can tell you now is the less you know about what will happen then the more receptive you will be to it. Words can never describe what a powerful and emotional experience it is. It may not save your M (although it certainly might), but it will at least change your perspective.
