Final answer:
Euripides composed plays for the City b. Dionysia festival in Athens, honoring the god Dionysus.
Step-by-step explanation:
Euripides' plays were written for the city of Athens, specifically for the b. City Dionysia festival, which was an annual festival held in favor of Dionysus. This festival included dramatic competitions where tragic poets like Euripides would present their plays.
The performances were part of a religious festival devoted to Dionysus, the god of wine and revelry, and included other poets like Aeschylus and Sophocles.