From the introduction:
Centzontotochtin, the Four Hundred Rabbits, are having a party, and many of the gods will attend and become drunk on pulque. It is a time for celebration and subterfuge in equal parts. The four principal gods - fiery Smoking Shield, kind Feathered Snake, celestial Hummingbird of the South, and terrible Tlaloc, will seek new wives and new alliances. It is the time of temicxoch, the Flowery Dream, when gods and men mingle and the spheres of influence are nudged, shaken, and re-aligned. One will emerge supreme by assembling the largest number of followers in his sphere.