Japanese Fireworks Festival Poster

"type": "event poster", "theme": "Japanese summer fireworks festival", "visuals": "background": "night sky filled with massive, colorful fireworks in gold, pink, blue, and purple", "midground": "river reflecting the fireworks, distant mountains, an arched bridge, and glowing city lights along the banks", "foreground": "crowd of spectators sitting on the grassy riverbank, some wearing traditional yukata, illuminated by warm lanterns on the right" , "typography_and_layout": "top_left": "catchphrase": "argument name=\"catchphrase\" default=\"夏の夜、想いが咲く。\"", "title": "argument name=\"festival name\" default=\"碧川市 清流花火大会\"", "subtitle": "—— 碧き流れに、光の華ひらく ——" , "mid_left": "date_time": "argument name=\"event date\" default=\"2026 8.15\" (土) 19:30〜20:30 (予定)", "venue": "会場：argument name=\"venue\" default=\"碧川（あおがわせ）河畔 清流大橋周辺\"" , "bottom_left_box": "style": "decorative vintage border", "content": "argument name=\"highlights\" default=\"約10,000発 音楽とシンクロする 華やかな花火\" 尺玉・スターマイン 水中花火 ほか" , "footer": "style": "dark blue banner at the bottom", "section_count": 3, "sections": [ "icon": "train", "title": "アクセス", "details": "walking distance and shuttle bus info" , "icon": "paper lantern", "title": "観覧のお願い", "details": "3 bullet points about trash, seating, and no drones" , "element": "QR code", "text": "最新情報は公式サイトでご確認ください" ], "bottom_edge": "organizer and contact info with dummy phone number"