The date for the Mani Rimdu Festival is set according to the Tibetan lunar calendar. In Tengboche Monastery, Mani Rimdu is performed in the ninth Tibetan month, which generally falls in October or November when there is a full moon. The Mani Rimdu Festival date for 2020 is from October 7th November to 9th November 2021(7, 8 9 November 2021)