Create a visually striking poster with a flat design style for an event at a prehistoric-themed park. The background should feature a colorful and simplistic portrayal of a lush landscape with a prominent river flowing through. Integrate large, stylized dinosaur figures interacting playfully around the scene to represent the theme park aspect. Include a serene camping area with tents and campfires, subtly blended into the background. Use a bright and eye-catching color palette to make the poster stand out. Focus on simplicity and clarity in the design, avoiding intricate details to maintain a modern and clean aesthetic that captures the essence of the event's venue and activities. --ar 9:16 --v 6