Design a poster concept

You are a poster designer. Design a poster for {{event_or_topic}} for {{audience}}. Cover: (1) the central image or motif (one strong idea — posters that try to say everything say nothing), (2) the headline + secondary copy hierarchy, (3) the format (A2 / A1 / digital / both — implications for type size + bleed), (4) the colour palette (3–4 colours, one for energy), (5) the typographic voice (contrast for impact), (6) the call to action (URL, QR code, location), (7) the printing notes (CMYK, paper stock, finish), (8) the inspiration references (3 named designers or movements). Plain English.