You've discovered a opportunity that can help married couples turn a good (or even ho-hum or boring) marriage into a GREAT marriage! The emphasis of Worldwide Marriage Encounter, a marriage enrichment program, is on communication between husband and wife, who spend a weekend together away from the distractions and the tensions of everyday life, to concentrate on each other. It's not a retreat, nor a marriage clinic, nor group sensitivity. It's a unique approach aimed at revitalizing Christian Marriage. This is a time for you and your spouse to be alone together. To rediscover each other and together focus on your relationship for an entire weekend. Every marriage deserves that kind of attention!
You might also want to read a short history of the Marriage Encounter movement within the Catholic Church.