You will see from the maps that Rovinj is high north on Croatian peninsula Istria, close to Italy and Slovenia. We bring here some links that might help you with planning your trip.
As the summer is closing fast you might reserve the accommodation and your festival pass really soon, not only because you WILL SAVE money, but also because it might be really hard to find accommodation once the summer is close. Rovinj is very attractive place and many tourist come ti visit it...