Leboku is the annual New Yam Festival of the Yakurr people, which comprises Ugep, Idomi, Ekori, Mkpani, Nko, Nyima, Agoi and Asiga communities. The Leboku New Yam festival is peculiar to the core Yakạạ speaking communities of Idomi, Ugep, Ekori, Mkpani and Nko and the international version is unanimously celebrated in Ugep once in a year. This is celebrated to honor the earth goddess and the ancestral spirits of the land in Ugep, one of the five settlements of Yakurr. The three-week festival is the culmination of many events: the beginning of the yam harvest, a time to appease the gods and ancestors, a public parade of engaged maidens, a commemoration of events that led to the migration from the Yakurr ancestral home to the present site, and a period of holiday in the Yakurr traditional calendar (mid-August through mid-September). The Yakurr calendar runs from August to July. During the Leboku, people keep away from intense farming activities and exchange visits with their families. The Leboku is also meant to usher in peace, good health and prosperity.
The three-week celebration starts with the Mblemi. On this day, the harvest of new yams is officially flagged off. Beautifully attired women from different farm-roads and groups later parade the town with their harvests.
The second day is the Janenboku, which literally translated means "women’s festival day". On this day, gifts are given to women by their loved ones and friends. Some traditional dances also take place. Tourists on the night of Janenboku are faced with two options – the traditional carnival-like drumming and dancing to the rhythm of the Ekoi drums to usher in the Ledemboku, held in the playground or the modern-day Miss Leboku Beauty Pageant, held in one of the hotels within the town.
Day three is the Ledemboku or "men’s festival day". It involves exchange of gifts to males, performance by the male Ekoi dancers, a parade of the Obol Lopon and his Bi-Inah (council of chiefs), a parade and dances by leg-bangle-wearing Leboku maidens to the rhythm of the Ekoi drums, and a display by the Etangala masquerade, whose only outing yearlong is on this day. It should also be noted that the all-embracing Etangala group have as its head, a non-Ugep, Chief Ig Ekpenyong, the Obol Etangala I of Ugep is an Efik man.