Marangu Mbege Festival in Marangu
Mbege, a mildly alcoholic banana drink traditional to the Chagga people of Kilimanjaro Region, is a confirmed real cultural beverage central to Marangu-area social life, though no independently confirmed Marangu Mbege Festival with a specific date and program could be located.
Wikipedia confirms mbege as a real, specific cultural product: a kind of banana drink traditional to the Chagga ethnic group of Tanzania, located in Kilimanjaro Region, described as a mildly alcoholic drink made from bananas.