* Theatre was closely associated with vineyards and wineries. In fact, the word "theatron" literally means "viewing place" or "place for seeing." The first theaters were built in vineyards, and they were used for festivals to honor Dionysus.
* Dionysus was often represented in plays. He was often depicted as a young, handsome man who loved to party and have fun. He was also known for his wild, uncontrolled behavior.
* Dionysus's festivals were a time for people to celebrate and let loose. They would drink wine, dance, and sing. They would also watch plays that were often about Dionysus or other gods and heroes.
* Greek theater was a way for people to connect with the divine. When people watched plays, they were able to experience the stories of the gods and heroes. They were able to learn about the values of Greek culture, and they were able to feel a sense of community.
In short, Dionysus was important to Greek theater because he was a god who represented many of the things that were important to the Greeks: wine, fertility, and theater.