Krishna Janmashtami, also known simply as Janmashtami or Gokulashtami, is an annual Hindu festival that celebrates the birth of Lord Krishna, the eighth incarnation of Vishnu. It is celebrated in Shravan or Bhadrapada on the eighth day (Ashtami) of the Krishna Paksha (dark fortnight) according to the Hindu lunar calendar. It is an important festival, especially in the Vaishnava tradition of Hinduism. According to the Bhagavata Purana (such as Raas Leela or Krishna Leela), the dance-drama tradition of Krishna's life, devotional singing at midnight at the time of Krishna's birth, fasting, night awakening, and a festival the next day are a part of Janmashtami celebrations.
Krishna was born in a realm of chaos. Lord Krishna took birth in a cellular jail in Dwapar Yug biologically to Vasudeva and Devaki. But Vasudeva had to cross the Yamuna River in a stormy night to pass on his child to a friend so save the child from the evil hands of Kansa. So, technically, Maiya Yashodha and Nanda of Gokul region of Mathura were the foster parents of Lord Krishna. Janmashtami is celebrated by the people by observing fast, singing devotional songs of love of Krishna and doing Jagran in the night. After Krishna's midnight birth, the infant Krishna idols are washed and clothed, then placed in a cradle. After this the devotees break their fast by distributing food and sweets.