Yumka is done on the 25th Lunar Day
Yumka is a Dakini practice of the three roots of Longchen Nyingthig, the terma cycle reveled by Omniscient Jigme Lingpa.
Yumka is practiced on Dakini Day (25th day of the Tibetan calendar) in Namdroling and many other Nyingma monasteries and centers around the world. The central meditation visualization of the practice is on the wisdom Dakini Yeshe Tsogyal, as the Khandro. The wisdom Dakini Yeshe Tsogyal was also a consort of Guru Rinpoche and the founding mother of Tibetan Buddhism. All female buddhas are manifestations of Wisdom Dakini Yeshe Tsogyal. Through this practice one understands  Dakini Yeshe Tsogyal to be the embodiment of the three kayas.
This practice is a tsog (or feast offering), so please bring a food offering, flowers and/or other offerings. For first time visitors, this a longer practice that is held on Dakini Day (the 25th day of the Tibetan lunar month).