Janmastami is celebrated on account of lord krishna birthday
on that day people will burn the statue of evil who is killed by krishna
many of us wear krishna getup and beat the pot in air
lord krishna and his wife sathyabhamma together killed a evil on this day
there are many programmes held in schools on this day

"Janmashtami" is celebrated on the eighth day of the dark fortnight of the month of Shravana (August–September) in the Hindu calendar. Rasa lila, dramatic enactments of the life of Krishna, are a special feature in regions of Mathura and Vrindavan, and regions following Vaishnavism in Manipur. While the Rasa lila re-creates the flirtatious aspects of Krishna's youthful days, the Dahi Handi celebrate God's playful and mischievous side, where teams of young men form human towers to reach a high-hanging pot of butter and break it. This tradition, also known as uriadi, is a major event in Tamil Nadu on Gokulashtami. Krishna Janmashtami is followed by the festival Nandotsav, which celebrates the occasion when Nanda Baba distributed gifts to the community in honour of the birth.

I hope this enough as well as helpful for you................Be happy....................