Will the Cruise Lines Accept Group Bookings?
All major cruise lines will accept group bookings, and in most cases you can score special rates and amenities, depending on how many are traveling in your group.
The cruise lines define a group cruise as a minimum of 16 people occupying eight cabins (third and fourth passengers in a cabin are allowed, but they do not count toward the total). The 16th person is considered a tour conductor and usually cruises free. Book 32 passengers and most cruise lines will allow you to travel free with a guest. However, be aware that free passengers must still pay taxes and port charges.