Final answer:
The number of plays a playwright produces for a festival can vary widely. Historically, the production ranged from several plays in a cycle during festivals like the Feast of Corpus Christi, to modern-day playwrights often focusing on a single new work. The exact number for festival 604 is unclear without additional context.
Step-by-step explanation:
The question 'How many plays would each playwright produce for each festival 604?' seems to contain a typo or a reference that is unclear. Without additional context, it is difficult to provide an exact number of plays produced per playwright for a specific festival numbered 604. However, I can share that historically, the production of plays by playwrights has varied widely depending on the era, the cultural context, and the capacity of theatres.
For instance, during the Elizabethan Age, a prolific playwright like William Shakespeare penned numerous plays that have stood the test of time. It was common for playwrights to produce a variety of works for different festivals and seasons. In contrast, most modern-day playwrights at regional theatres in the U.S. work on a smaller scale, often focusing on a single new work at a time.
If we consider historical contexts like The Feast of Corpus Christi during the 1350s, plays were performed as part of mystery cycles which could include several episodic plays presented over the course of the festival. Nevertheless, the specifics of how many plays a single playwright would contribute to such a festival are not well documented.