Please answer the following question: Generate a question about the following movie plot: The film is structured as a series of interconnected flashbacks. Following the death of his father Hal, Oliver reflects on their relationship following the death of Oliver's mother, Georgia. Shortly after her death, Hal came out to his son and began exploring life as an openly gay man. He becomes active in the gay community, finds love and becomes more honest with himself and with his son. As a result, Oliver and Hal become closer during this time. Shortly after Hal's death, Oliver meets Anna, a French actress, at a party. Inspired by his father's attitude towards the end of his life and their relationship, Oliver decides to pursue a romance with her.
Answer:
What did his father become an active member of?