This coming week, India celebrates Karthik Poornima. The peacock is Lord Karthikeya’s vaahana (vehicle).
According to Wikipedia:
Karthik Poornima (Karthik purnima) is a Hindu holy day celebrated on the full moon day of the lunar month Karthik (November–December). It is also known as Tripuri poornima and Tripurari Poornima. It is sometimes called Deva-Diwali or Deva-Deepawali – the festival of lights of the gods. The Karthik Purnima festival also coincides with the Sikh festival of Guru Nanak Jayanti.
Karthik poornima is also the birthday of Matsya, god Vishnu’s fish-incarnation (Avatar). It is also the birthday of Vrinda, the personification of the Tulsi plant and of Kartikeya, the god of war and son of Lord Shiva. This day also is considered dear to Radha, the lover of Krishna – Vishnu’s incarnation. It is believed that Krishna and Radha danced rasa and Krishna worshipped Radha on this day.