yes but the person is obliged to seek confirmation at the earliest opportunity if it can be done without grave inconvenience, 3 weeks before the wedding is not the time to bring up this question, bring it up in your initial interview with your pastor, or even before if you are not yet engaged. It generally takes about a year for an adult Confirmation class, and here at least the bishop confirms adults once a year, at Pentecost. If one party refuses to be confirmed the pastor is justified in inquiring why before he allows them to plan their marriage.
