the hùng kings' temple festival (vietnamese: "giỗ tổ hùng vương" or "lễ hội đền hùng") is a vietnamese festival held annually from the 8th to the 11th day of the third lunar month in honour of the hùng vương or hùng kings. the main festival day, which is a public holiday in vietnam since 2007, is on the 10th day.