I got this from Britannica.com
Great Dionysia, also called City Dionysia , ancient dramatic festival in which tragedy, comedy, and satyric drama originated; it was held in Athens in March in honour of Dionysus, the god of wine. Tragedy of some form, probably chiefly the chanting of choral lyrics, was introduced by the tyrant Peisistratus when he refounded the festival (534/531 bc), but the earliest tragedy that survives, Aeschylus’ Persai, dates from 472.
The festivals were attended by all Athenian citizens (likely women as well as men) and visitors from throughout Greece. In the tragic competition, each of three tragic poets wrote, produced, and probably acted in three tragedies on a single theme. Each poet also presented a satyr play, which treated some heroic subject in burlesque fashion. Judges, chosen by lot, awarded a prize to the best poet. In comedy, introduced in 486, five poets competed for the prize, each with one play. The satyr play was always the work of a tragic poet, and the same poet never wrote both tragedies and comedies. In 440 comedy was also introduced into the Lenaea, the minor festival of Dionysus held in January, and tragedy was added 10 years later.