The full moon of Magha
Magha (the lunar month) + purnima (full moon).
The full moon of the month of Magha, in January or February, a day of bathing in rivers. Guru Ravidas Jayanti falls on it.
Guru Ravidas Jayanti is the Gurpurab of Magha Purnima. This article sets out the day, what we know of the Guru's hymns, and how late the early accounts are.
Vaishali and Kesariya in Bihar remember the founding of the Bhikkhuni Sangha, the Ratana Sutta and the Buddha's farewell gift of his alms bowl.
Gridhrakuta, the Vulture Peak at Rajgir in Bihar, is where the Buddha stayed during rains retreats and where Mahayana tradition sets the Heart and Lotus Sutras.
Shravasti, on the Rapti in Uttar Pradesh, holds Jetavana, the monastery where the Buddha spent twenty-five rainy seasons and gave most of his teachings.