Godha Jayanti, also known as Andal Jayanti, is dedicated to Andal, an incarnation of Goddess Lakshmi. This unique festival in Tamil month Aadi celebrates the birth of Godha Jayanti in Vishnu Temples. Godha Jayanti 2015 date is August 16. It is observed on the Pooram or Puram birth star, which is one among the 27 Nakshatras in Hindu astrology.
Godha 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 Godha is an incarnation of Goddess Lakshmi. Even her birth is wrapped in mystery. You can read about an important legend here.