Krishna Janmashtami
 

Krishna Janmashtami (Devanagari कृष्ण जन्माष्टमी) , also known as "Krishnashtami","Saatam Aatham" ,"Gokulashtami", "Ashtami Rohini", "Srikrishna Jayanti", "Sree Jayanthi" or sometimes merely as "Janmashtami", is a Hindu festival celebrating the birth of Krishna, the eighth avatar (incarnation) of Vishnu.

Krishna Janmashtami is observed on the eighth day of the dark half (Krishna Paksha) of the month of Shraavana in the Hindu calendar, when the Rohini Nakshatram is ascendent. The Hindu calendar being lunar, these two events [the day being the eighth of the waning moon (Krishna-paksha Ashtami) and the Rohini Nakshatram being ascendent] may overlap for only a few hours. In such an event, the festival may be celebrated on different (but successive) days by different people, depending on their local or family traditions.

The festival falls sometime in the months of August/September of the Gregorian calendar. Source: http://en.wikipedia.org/wiki/Janmashtami

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