On a typical day, Kat O – a tranquil island within the Hong Kong Unesco Global Geopark, in the northeastern waters of the New Territories – sees just a small number of visitors, who arrive mostly for a scenic hike through its heritage trails. However, with an island-wide festival taking place from October 11 to 15, things are about to get lively. In the run-up to the festivities, villagers are busy completing a giant bamboo theatre, traditional puppets and parade lanterns, while local artists...