Your dream contains a mix of intense emotions and complex imagery, which can provide valuable insights into your subconscious thoughts and feelings.

1. Setting and Characters: The downtown setting and the presence of known figures (Jen, Paul Mescal, Gracie Adams, Dionne Warwick, and Heather) suggest that your dream may reflect your social interactions and feelings towards these individuals. The presence of public figures could indicate a feeling of scrutiny or pressure in your social life.
2. Chaos and Violence: The act of being handed a gun and shooting someone, even if it was unintentional, signifies a feeling of loss of control or powerlessness in a situation. Guns in dreams often symbolize aggression, protection, or a desire to assert oneself. Shooting Jen, who you seem to have an emotional connection with, could represent feelings of guilt or fear of harming those close to you, whether emotionally or socially.
3. The Reaction of Others: Dionne Warwick's role as the chief of police may symbolize a figure of authority or judgment in your life. Her indifference to the situation suggests that you might feel misunderstood or that your actions are not being taken seriously by others. This can point to feelings of isolation or being judged harshly for your choices.
4. Emotional Aftermath: The transition to the theater and the encounter with Heather indicates a shift from chaos to a more personal, emotional confrontation. Heather's tears and your reaction demonstrate deep feelings of remorse or fear of losing someone important. This may reflect a fear of relationships being damaged or misunderstandings leading to emotional pain.
5. Overall Theme: Your dream seems to encapsulate themes of guilt, fear of harm, and the complexity of your relationships. The act of crying upon seeing Heather suggests a release of pent-up emotions and a longing for connection and understanding, potentially highlighting unresolved feelings in your waking life.

Advice: Consider reflecting on your relationships and any underlying feelings of guilt or anxiety you may have. It might help to talk to someone you trust about these feelings or to journal them out. Acknowledging these emotions can lead to clarity and healing in your waking life.