The dionysia was a religious festival honoring which greek god?

The Dionysia was a religious festival honoring the Greek god Dionysus (hence the name). It was the second largest festival, after the Panathenaia, and the events were theatrical performances such as tragedies and comedies. Dionysus was the god of grape harvesting, wine-making, wine, religious ecstasy, fertility and ritual madness. 

I’m going to guess #4 since that seems pretty logical.

She came about disguised as his ally deiphobus