Kartik Purnima is associated with several mythological events in Hinduism, each adding layers of significance to the festival. Here are some of the prominent mythological events linked to Kartik Purnima:

1. The Slaying of Tripurasur by Lord Shiv: One of the most significant events associated with Kartik Purnima is the slaying of the demon Tripurasur by Lord Shiv. According to Hindu mythology, the demon Tripurasura had gained immense power and was wreaking havoc on the world. To restore peace, Lord Shiv destroyed Tripurasura’s three flying cities (Tripuras) with a single arrow on Kartik Purnima. This event symbolizes the triumph of good over evil.
2. Birth of Kartikeya (Murugan): Kartik Purnima is also associated with the birth of Kartikeya, the son of Lord Shiv and Goddess Parvati. Kartikeya, also known as Murugan, Skanda, or Subrahmanya, is revered as the commander of the gods and the deity of war, courage, and victory.
3. Krushna’s Ras Leela: In some regions, Kartik Purnima is associated with Lord Krushna’s Ras Leela, the divine dance performed by Krushna with the Gopis (cowherd girls) of Vrindavan. It is believed that Krushna performed Ras Leela on this night under the light of the full moon, symbolizing divine love and devotion.
4. Goddess Ganga’s Descent to Earth: In some regions of India, Kartik Purnima is associated with the descent of Goddess Ganga (the river Ganges) to earth. According to Hindu mythology, King Bhagiratha performed intense penance to bring the divine river down to earth to cleanse the sins of his ancestors. It is believed that Goddess Ganga descended to earth from the heavens on Kartik Purnima, fulfilling King Bhagiratha’s prayers and purifying the land.
5. Prabodhini Ekadashi: As mentioned earlier, Kartik Purnima also marks the conclusion of the Chaturmasa period and the awakening of Lord Vishnu from his cosmic sleep (Yoga Nidra) on the day of Prabodhini Ekadashi. This event is significant in some traditions, symbolizing the beginning of a new phase of spiritual awakening and enlightenment.

These mythological events are celebrated and remembered on Kartik Purnima through various rituals, prayers, and cultural festivities across India. They symbolize themes of righteousness, purity, and the victory of good over evil, inspiring devotees to cultivate virtues and seek divine blessings.