Jambay Lhakhang Drup is a four-day festival held at the Jambay Lhakhang temple in Bumthang. The festival is famous for the 'Mewang,' the fire ceremony, and the 'Terchham,' the naked dance performed at midnight. The festival celebrates the temple's founding and its connection to Guru Rinpoche, who is believed to have brought Buddhism to Bhutan. It's a magical and unique experience that allows visitors to witness a rare display of ancient Bhutanese rituals.