1	The First Month is Atlcoualco The first month honors Tlaloc. During the ceremony of this month, the people of the Anahuac offer their most precious possession to Tlaloc, their children. It takes a priest with a strong will to open the chest of a small child and take out the beating heart...
2	The Second Month is Tlacaxipeualitzli During this time, we honor Xipe Totec. In his name men are flayed after having given their service, and their skins are then worn by other men until the beginning of Uei Tocoztli. At this time the gladiatorial sacrifices are held. Great warriors, captives, are tied to a stone by one foot and given a sword edged in cotton to defend themselves. One at a time, other warriors armed with real swords attack him. Once he has been wounded he is thrown back on the stone and his heart is removed.
3	The Third Month is Tocoztontli. Again, Tlaloc is honored, and again, children are offered to him. The rites for Xipe Totec, begun in the previous month, are continued.
4	The Fourth Month is Uei Tocoztli. During this time, Centeotl, God of the Maize, and Chicomecoatl, Goddess of the Growing Crops, are honored. Throughout the Anahuac there is ceremonial bloodletting, and there is a dance, performed by young girls, to bless the seed corn. In the main squares at Tenochtitlan and Texcoco, images of Chicomecoatl made of amaranth dough are set up. In private, at the temple of the goddess, an impersonator of Chicomecoatl gives her service.
5	The Fifth Month is Toxcatl. During this time, we honor Tezcatlipoca. A month before the ceremony, a young man is chosen to be the ixiptla, the impersonator, of Tezcatlipoca. For a month he is treated with complete respect, he's given riches, given everything he wants; he's taught to play the flute - sacred to Tezcatlipoca - and is given four beautiful wives. On the day of Toxcatl he walks up the pyramid alone, breaking his flutes as he goes. There he gives his service. Afterwards, the four girls who've been his wives get to divide up all his riches.
6	The Sixth Month is Etzalqualiztli Again, we honor Tlaloc, but there is much more that happens in this month. In honor of the Lord of the Storm, a canoe is sent out into the Lake, filled with the hearts of war captives who've given their service. A boy and a girl, richly dressed, are also in the canoe - which is then sunk, drowning the boy and girl. Also at this time, an impersonator of Quetzalcoatl gives his service, much as the impersonator of Tezcatlipoca did at Toxcatl.
7	The Seventh Month is Tecuilhuitontli. At this time, we honor the Goddess of the Salt and the Ocean, Huixtocihuatl. An ixiplta is chosen to play the part of Huixtocihuatl; at the appointed time she, along with four girls assigned to be her "fundament," give their service on the pyramid. As the ixiptla of Huixtocihuatl is giving her service, her throat is pierced with a special weapon made from the snout of a sawfish.
8	The Eighth Month is Uei Tecuilhuitl. Xilonen, the goddess of the Young Corn, is honored during the eighth month. An ixiplta of Xilonen is chosen, and she is carried about for much of the day atop a litter covered with fresh vegetables and fruit. At the appointed time she is laid on her back atop the produce and her head is severed.
9	The Ninth Month is Tlaxochimaco. At this time, in Tenochtitlan, a great sacrifice of captives to their patron, Huitzilopochtli, is made. There and elsewhere there are ceremonies to honor Yacatecutli, patron of merchants. The merchants purchase slaves for this ceremony, of both sexes, looking for those who are comely and who can sing and dance as well. After they have entertained the merchants and the god, they are asked to give their service...
10	The Tenth Month is Xocotl Uetzi Xiuhtecuhtli, the Old Fire God, and Cihuacoatl are honored at this time. To give their service, men and women are put into the fire. Before they are burnt, though, their bodies are pierced with hooks and they are dragged out by the priests. Then their hearts are taken on the stone.
11	The Eleventh Month is Ochpanitzli Ochpanitzli is dedicated to the honor of Toci, Teteo Innan, Tlazolteotl. At this time there are many ceremonies, many dances; an ixiptla of Tlazolteotl leads several of them. At the appointed moment, a priest lifts her on his back so that she's facing away and their arms are interlocked. Another priest then severs her head. After that, she is flayed, and a priest or priestess dances in her skin.
12	The Twelfth Month is Teotl Eco Teotl Eco celebrates the "Return of the Gods." In most places, there are no sacrifices associated with Teotl Eco. An amaranth flour body representing Tezcatlipoca is made, and when a footprint is discovered on it it is understood that he has arrived. The serpentine dance, like the one performed at Toxcatl, then begins.
13	The Thirteenth Month is Tepeilhuitl During Tepeilhuitl, we honor the spirits of the mountains, the Power that is in the high mountain peaks. Five ixiptlas, four women and one man, are selected to impersonate the spirits of the mountains. At the appointed time, these walk up the pyramid to give their service.
14	The Fourteenth Month is Quecholli Quecholli honors the God of the Hunt, Mixcoatl, and his lady, Yeuatlicue. At this time, chosen women impersonate the deer, wearing deer costumes, and are hunted by archers using small bows. Four of the deer impersonators, the ixiplta of Mixcoatl, and the ixiptla of Yeuatlicue, all give their service on this occasion.
15	The Fifteenth Month is Panquetzalitzli Panquetzalitzli is dedicated to Huitzilopochtli is Tenochtitlan, and to the patrons of the cities in other places; to Tezcatlipoca in Texcoco, to Quetzalcoatl in Cholula, to Mixcoatl in Tlaxcala. At this time, in Tenochtitlan especially, a large number of war captives, mostly men, are required to give their service.
16	The Sixteenth Month is Atemoztli At this time, we again honor Tlaloc. A young girl is offered to the Rain God; she is named Quetzalxoch, and she walks up the steps of the pyramid all dressed in blue. At the top she offers her service.
17	The Seventeenth Month is Tititl During Tititl, we honor the Old Princess, Ilamatecuhtli, the spirit of the maize at harvest. A woman acts as the ixiptla of Ilamatecuhtli, and she gives her service atop the pyramid...
18	The Eighteenth Month is Izcalli At Izcalli, we again honor the Old Fire God, Xiuhtecuhtli. In Tlaxcala there is another ceremonial hunt of deer-women; in Cuahtitlan there is an arrow-sacrifice, a man tied to a scaffold and shot to death with arrows.

The Festivals of the Sacred Calendar