If all you do is the weekend at Retrouvaille, you can go anywhere. However, the full program is the weekend plus 6 follow-up or "post sessions". They are scheduled to begin immediately after the weekend and they are very helpful for reconciling.
It is possible to do the weekend in one place, and then do the post sessions in another. But you would need to get permission from the post session group. I can't imagine they would object.
What state are you in? Some states have quick divorces, some require 6 months to a year to get divorced.
