# ContextCity // one codexierge to guide 'em all

- **Event:** [GPT-5 Startup Hackathon NYC](https://cerebralvalley.ai/e/gpt5-nyc)
- **When:** Sep 27 at 9:00 AM – Sep 28 at 5:00 PM (EDT)
- **Where:** The Malin Flatiron, New York, NY
- **Team:** [Michael Chow](https://cerebralvalley.ai/u/michow)
- **GitHub:** https://github.com/dart-technologies/context-city-codex
- **Demo video:** https://youtu.be/XryFMA-IeTg
- **Gallery:** https://cerebralvalley.ai/e/gpt5-nyc/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/gpt5-nyc/hackathon/gallery/4

- We built the ContextCity Codex concierge: an Expo mobile experience where Dartagnan guides travelers through city highlights.
 - GPT-backed workers curate social signals into reels, Remotion renders localized MP4s, and the app surfaces rationale, itinerary, and concierge cues.
 - A “Route to {POI}” card and localized overlay tie reels directly to multi-step actions (plan, book, guide, celebrate).
  - The demo showcases Felix in SoHo across French, English, and Spanish, including synchronized narration, subtitles, and concierge voice.

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Markdown version of https://cerebralvalley.ai/e/gpt5-nyc/hackathon/gallery/4. Site index for agents: https://cerebralvalley.ai/llms.txt · full text: https://cerebralvalley.ai/llms-full.txt