Text us we will give you the group booking number or you can also visit Royal Caribbean's website directly to book.
Technically no, however it is strongly encouraged especially with this far in advance notice. Without a passport you will be required to have your driver's license and birth certificate.
https://www.royalcaribbean.com/content/royal/cruise-ships/utopia-of-the-seas/things-to-do https://www.royalcaribbean.com/content/dam/royal/resources/infographics/ut-entertainment-infographic-nightlife-shows.pdf
https://www.royalcaribbean.com/faq
https://www.royalcaribbean.com/booked/cruise-ship-wifi