The exact routes are set a few weeks before the event starts. As soon as the routes are set, you will be able to view it on the arrival info on your booking. In the meantime, you can see an example route here, as well as lots of information regarding the highlights and things to do on route.
Week 27 will spend the first half of the week sailing and arrive back to split for the festival Friday night. Week 28 will spend the first two nights in Split for the festival and set sail Monday morning.
If you are booking with other yachts, you must ensure all yachts are booked from the same marina to ensure your group will remain together for the duration of the week.
Note that the Ultra Route is separate to the Croatia, Original Route and will not interact with the yachts on this route during the week.