Trying,

You have agreement on going to Retrouvaille, so there is no reason to bring up any questions except, "what should we bring?" Don't challenge her.

You will be able to tell by lunchtime Saturday if she is stonewalling you, or being open and honest with her answers. In my opinion, there is no reason to not be open and honest, it's a great opportunity to say what has been bothering you and actually be heard! But if she is stonewalling, then I would recommend that at lunch or during one of the breaks, you approach a team couple and let them know that you are having trouble. The team couples are just wonderful. I don't see how anyone can talk to them and not be moved. You should not try to convince your wife of anything, just follow the program, and if you need help, ask for it.

You will see. It's not like anything else you've ever done. Try not to go in tired on Friday. Retrouvaille is not the place to try to catch up on your sleep!