Megalarta was a festival connected to the worship of Cybele or other manifestations of the Great Mother goddess, celebrated in various Greek and Anatolian communities. The observance included elaborate processions, ecstatic dances, and offerings of bread and agricultural products. Details remain obscure, but the festival's name suggests magnitude and ritual abundance. In poetry, Megalarta serves as an emblem of ancient fertility cults, maternal divine power, and the archaic religious practices that preceded classical civilization, often invoked in verse exploring mythological origins and primal spirituality.

Megalarta's association with the Great Mother cult places it within springtime celebrations of Cybele featuring processions and offerings. The festival demonstrates Eastern mystery religions' influence on Greek and Roman religious practice. Understanding Megalarta helps contextualize the spread of Great Mother worship and spring festivals' connection to fertility and renewal themes. The processions' public character illustrates how mystery cults maintained both public rituals and secret initiatory practices.