The festival commemorating the death of the demoness Holika.
Read about Holi here
http://utkarshspeak.blogspot.com/2011/03/holi-festival-of-colours.html
http://utkarshspeak.blogspot.com/2012/03/holi-womens-day.html
http://utkarshspeak.blogspot.com/2013/03/holi-and-karma.html