Vertical event poster for "{{event_name}}". The event name is the large, bold headline at the top, spelled exactly as written. Below it, smaller but clearly legible text reads "{{date_time_and_venue}}". Main illustration: {{poster_visual}}, in a {{design_style}} style, with a strong visual hierarchy so the headline reads first, then the image, then the details. High contrast between text and background, a limited color palette, clean margins, and nothing covering the text. No other words, logos, or small print.