Huei Tozoztli.

Headword: 
Huei Tozoztli.
Principal English Translation: 

the name of a month of twenty days
James Lockhart, We People Here: Nahuatl Accounts of the Conquest of Mexico, Repertorium Columbianum v. 1 (Los Angeles: UCLA Center for Medieval and Renaissance Studies, 1993), 176, 178.

also, the name of the fourth month of the pre-Columbian Nahua calendar; also a spring festival (see the Codex Borbonicus)

Orthographic Variants: 
Huey toçoztli, Huey Tozoztli
Attestations from sources in English: 

The fourth month involved four days of fasting, and cattails sprinkled with auto-sacrificial blood in all the houses, maguey thorns with blood, atolli (also called aquetzalli) poured into vessels, and rituals involving maize plants and ears and young girls with long hair.
Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 2 -- The Ceremonies, no. 14, Part III, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1951), 59.

28 Abril. huei toçoztli = 28 April. Huey Tozoztli. (central Mexico, early seventeenth century)
Codex Chimalpahin: Society and Politics in Mexico Tenochtitlan, Tlatelolco, Culhuacan, and Other Nahuatl Altepetl in Central Mexico; The Nahuatl and Spanish Annals and Accounts Collected and Recorded by don Domingo de San Antón Muñón Chimalpahin Quauhtlehuanitzin, eds. and transl. Arthur J. O. Anderson and Susan Schroeder (Norman: University of Oklahoma Press, 1997), vol. 2, 122–123.

themes: 
Gifts, Offerings, Sacrificial Rites
Religion (Indigenous)
Time, Calendar, Frequency
Women, Men, Gender