Create an original, production-quality image-generation prompt for this brief: design a memorable key visual for an event before typography is finalized. Inputs: {{event_type}}, {{theme}}, {{audience}}, {{city_or_venue}}, {{mood}}. Define the focal subject, environment, composition, camera or illustration perspective, lighting, material behavior, depth, color mood, and negative space. Preserve exact product, architecture, logo, packaging, UI, or person-reference details when supplied; do not redesign them unless asked. Produce a high-impact central visual, symbolic detail, strong focal point, background texture, clear zones for date and title, and a scalable composition. The final visual should look intentional at advertising or editorial quality, not like generic AI art. Avoid distorted anatomy, duplicate objects, fake text, clutter, plastic skin, inconsistent reflections, impossible structure, and excessive effects. If copy will be added later, keep a clean text-safe zone and do not render small body copy into the image.