Wikipedia
Arrhephoria was a feast among the Athenians, instituted in honor of Athena. The word is derived from the Greek term , which is composed of , "mystery", and , "I carry". This feast was also called Hersiphoria, from Herse, the daughter of Cecrops, on whose account it was established.
On the Athenian Acropolis two girls aged between seven and eleven were elected to live for a year at a time as arrhephoroi, tending the sacred olive tree and weaving, with the help of other women, the new robe for Athena. Proud parents commemorated their daughters' service by making dedications on the Acropolis. At the annual festival of the Arrhephoria the girls (according to Pausanias), placed on their heads what the priestess of Athena gives them to carry and neither the priestess knows what it is she is giving them, nor do the girls who carry it. In the city there is a sacred precinct not far from that of Aphrodite in the Garden and through it runs a natural underground passage. Here the virgins descend. Down below they leave behind what they have brought and take something else and carry it, veiled as it is. These two virgins are discharged forthwith and others are taken up to the Acropolis in their place.
Interpretation of the festival is difficult because of the lack of sources, but it is clear that the virginal arrhephoroi are chosen from the noblest families of the city and are deployed in a context of impregnation (dew), sexual power ( Aphrodite and Eros), and birth (Erichthonios). The word "arrhephoros" etymologically probably means "dew carrier", which at first sight does not help. The arrhephoroi were charged with weaving the peplos (garments) for Athena. The aletrides ground the grain for Athena. The arkios were the priestesses who celebrated a rite intended to forgive an offense against Artemis. The kanephorai were the girls that carried the baskets with all of the offerings to the festival.
Archaeological evidence reveals that from near the Erechtheion a secret stairway led off the Acropolis past a small rock-cut shrine of Eros and Aphrodite, near which was the precinct to which they were going. They mythical associations of the arrhephoroi are with their starting-point the Erechtheion. Kekrops, the first king of Athens, whose tomb was in the complex, had three daughters, Aglauros, Herse, and Pandrosos. The mystery revolves around innocence, obedience, and fecundity. They were given a closed basket by Athena who forbade them to open it. One night Aglauros and Herse gave in to curiosity, opened the basket, and saw Ericthonios, the mysterious child of Hephaestus. Snakes also appeared out of the basket, and in terror the two girls jumped off the Acropolis to their deaths. The sanctuary of Aglauros lies at the foot of the cliff; it may have been the precinct to which the arrhephoroi descended. Pandrosos, who did not succumb to this fatal curiosity, has a shrine next to the sacred olive tree on the Acropolis itself.
In the fifth century B.C. Aristophanes wrote Lysistrata which explained the stages of the women during this festival: "When I was just seven, I was arrephoros, then at ten, I was aletris for the archegetis, then I carried the orange robe as arkios (bear) at Brauronia, and finally, having become a beautiful girl, I was kanephoros, with a necklace of dried figs."
These stages have certain tasks and through that displays the ancient system that all girls must go by when reaching puberty. The stages of this "initiation" are as follows. The arrhephoroi comes first and it is a time when the female child dresses in white and begins to weave for the offering to Athena. This is an art that is performed by women a lot during the time and therefore must be taught at a young age. The second stage is to teach the female how to bake, bread is the specific item that is taught. The next step, the third, is considered a symbol of death and resurrection. The female must attend and participate in the festival with the older women. These stages are all tasks that the female child will use for the rest of their lives and therefore are held with high importance and expectation. It is believed through sources that Attica was one of the first in history to have one of these festivals.