> Miracle Plays and Mysteries were religious dramas that developed in Christian nations during the late Middle Ages, originating from liturgical services and evolving into large-scale public performances. These plays were deeply rooted in the Catholic tradition, with their roots tracing back to the 9th and 10th centuries, when simple dramatizations of Gospel passages—such as the Quem Quæritis dialogue at Easter—were performed within churches.
> Mystery Plays were based on biblical narratives, dramatizing events from the Creation to the Last Judgment. They reached their peak in the 15th century and were often performed in cycles by town guilds, with each guild responsible for a specific episode. Famous examples include the York Mystery Plays (48 pageants), the Towneley Plays, and the Chester Cycle. These performances were typically staged on pageant wagons moving through city streets, often lasting multiple days.
> Miracle Plays focused on the lives and miracles of saints, particularly those associated with feast days and religious festivals like Corpus Christi. Notable examples include The Miracle of Theophilus by Rutebeuf and plays centered on the miracles of Our Lady. These were performed in vernacular languages and often incorporated comic or secular elements to engage audiences.
https://www.newadvent.org/cathen/10348a.htm
> These two names are used to designate the religious drama which developed among Christian nations at the end of the Middle Ages. It should be noted that the word "mystery" has often been applied to all Christian dramas prior to the sixteenth century, whereas it should be confined to those of the fifteenth century, which represent the great dramatic effort anterior to the Renaissance. Before this period dramatic pieces were called "plays" or "miracles". The embryonic representations, at first given in the interior of the churches, have been designated as liturgical dramas.
edit: something as an alternative to secular theater / film today?