The Archbishop of Canterbury is in charge of leading the people of Canterbury to the spiritual realm and find God. Christmastide is part of the liturgy for the Christians to bear nearer to the highest being who is God. Even though Canterbury is not Catholic is an Anglican community, they meet together in the Christmastide.
It represented freedom because they were free to do whatever they wanted. However, it was dark because they were always drunk. Dionysus inspired these because he caused them. The forest represents freedom.