The Thesmophoria festival was held in her honor

An annual celebration known as Thesmophoria was celebrated in honor of Demeter and her daughter Persephone in ancient Greece. The celebration used to occur primarily in late autumn, around the time of seed sowing. It praised both agricultural and human fertility. Men were not permitted to take part in any of the rites or rituals performed at Thesmophoria; only adult females were permitted. These ceremonies and rites were therefore kept a secret.

Scarifying the pig's women was one of the festival's most well-known rites. The corpses were then placed within Megara's pits to begin the process of decomposition. Finally, to assure a successful crop, the decaying remains were dispersed across fields before seeds were seeded. Three days of Thesmophoria were held in Athens. Anodos ("ascent"), Nesteia ("abstinence"), and Kalligeneia ("beautiful birth") were the names of these days. One of the most significant and well-known celebrations in ancient Greece was theophoric. Demeter is also known as Thesmophoros (the "giver of customs") about the event.