"This timely volume pays tribute to the Belgian scholar Michel Graulich (1944–2015), who revolutionized our knowledge of the religious life of Tenochtitlan and its neighboring cities by interpreting the great collective rituals in light of mythology. Inspired by his work, researchers from a variety of disciplines provide novel interpretations of the eighteen 20-day festivals of the Mesoamerican solar calendar. This innovative collection includes essays that focus on Central Mexican communities during the Late Postclassic period, while others draw lucid comparisons with societies such as the Maya and analyze transformations resulting from the Spanish Conquest."—Dr. Leonardo López Luján, Director, Proyecto Templo Mayor, Instituto Nacional de Antropología e Historia