Karva Chauth

The married woman fasts to keep her husband healthy, because if he is healthy she is Saubhagyavati, the happy woman.

Read about Karva Chauth here
http://utkarshspeak.blogspot.com/2010/10/karva-chauth-part-1.html
http://utkarshspeak.blogspot.com/2010/10/karva-chauth-part-2.html