When was Athena's birthday celebrated?

Athena's birthday was celebrated during the Panathenaea festival, which took place annually in Athens. This festival, dedicated to the goddess Athena, featured various events, including athletic competitions and cultural performances, and culminated in a grand procession to her temple, the Parthenon. The most significant celebration occurred every four years, known as the Greater Panathenaea, which included more elaborate festivities.