Dharma Day (Asalha Puja) is a significant festival in Buddhism that commemorates the First Sermon of the Buddha, when Siddhartha Gautama first taught the path to enlightenment. Observed by some cultures on the full moon of the lunar month of Asalha, it marks the beginning of the Buddhist teaching tradition and the formation of the monastic community (Sangha). The day is often honored through temple visits, meditation, and acts of generosity, emphasizing reflection on the Dharma and the importance of ethical living.