Aadi Pooram, also known as Aandal Jayanti, is dedicated to Aandal, an incarnation of Goddess Lakshmi. This unique festival in Tamil month Aadi celebrates the birth of Andal. Aadi Puram is also dedicated to Goddess Shakti and it is believed that the Goddess comes down to bless the people on this day. In 2008, the date of Aadi Pooram is August 4. Pooram or Puram is one among the 27 Nakshatras.
Aandal is renowned for her steadfast devotion for Sri Ranganatha (Lord Vishnu) and for the unparalled literary compositions of Thiruppavai and the Nachiyar Thirumozhi.
There are numerous legends in Tamil folklore which clearly indicates that she is an incarnation of Goddess Lakshmi. Even her birth is wrapped in mystery. You can read about an important legend here.
Aadi Puram is of great significance in Lord Vishnu Temples in Tamil Nadu. Equally important is the day in Shakti Temples.