to observe special days (see Molina), most often religious days in the calendar
Alonso de Molina:
ilhuitlacaquitia. nite. (pret. oniteilhuitlacaquiti.) echar las fiestas. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 37v. col. 1. Thanks to Joe Campbell for providing the transcription.