At some point, all of the dragons will meet up. This doesn't have to be at the beginning. They can wander around for a few days, maybe meet one person or a whole group. Eventually, everyone will meet up somewhere.
Don't say you don't have enough time. You have exactly the same number of hours per day that were given to Helen Keller, Pasteur, Michaelangelo, Mother Teresa, Leonardo da Vinci, Thomas Jefferson, and Albert Einstein. — H. Jackson Brown