Hacktoberfest Hack Day Mumbai x FAIR
Join us for Hacktoberfest 2026 in Mumbai — a community-driven day dedicated to open-source AI, collaboration, and building in public. 🚀
This year's theme is AI BELONGS TO EVERYONE 🤖. You'll spend the day learning, experimenting, and shipping with open-source and open-weight AI models — solo or in a team. Whether you're a first-time contributor or an experienced open-source developer, come together with fellow hackers to learn, contribute, collaborate, and get your pull requests merged.
⚠️ IMPORTANT: You must also register on the MLH platform. Registering on Luma alone is not enough — complete your MLH registration here: https://events.mlh.com/events/15178-hacktoberfest-hack-day-mumbai-x-fair Only participants registered on both platforms will be approved.
📅 11 October 2026
⏰ 9:00 AM – 5:00 PM
📍 Paytm – One 97 Communications Ltd, Mumbai
Challenges 🏆
Best Use of Gemma 4
It's time to see how much you can build with a lightweight, open model. Gemma 4 packs multimodal intelligence into an open-weights model that you can access through the Gemini API. So, what can Gemma 4 bring to your project?
- Multimodal Experience: Work with text and images to create an assistant that understands more of what users share.
- Focused AI Tools: Build a focused AI tool for learning, creativity, productivity, or your community.
- Rapid Prototyping: Experiment with an open model while using the Gemini API to move quickly from an idea to a working prototype.Bring your idea to life… what will you build with Gemma 4 today?
Best Open-Source AI Project
Build an original project that uses open-source or open-weight AI as an important part of how it works. Teams could create an agent skill, build with an open-weight large or small language model, or build or adapt an open-source model harness. These are examples within one challenge, and teams may combine them.
- Open-source or open-weight AI must be an important part of the project.
- The project must be published in a public GitHub repository and use an open-source license.
- An agent skill must comply with the Agent Skill Open Standard.
- A model-harness entry must include an original implementation or meaningful changes to an existing open-source harness.
What to expect
🧑💻 Work on real open-source AI projects and submit contributions
🤝 Meet and collaborate with developers from the community🛠️ Learn how to contribute through Git and GitHub
💡 Discover new projects, tools, and ideas
🌐 Connect with fellow open-source enthusiasts
🔥 Spend the day hacking, learning, and shipping
Bring your laptop, your ideas, and your willingness to build. Whether it's your first pull request or your fiftieth, there's a place for you.
Let's hack, contribute, and celebrate open source together!
Who can attend?
This event is open to students and working professionals — everyone is welcome.
Schedule
9:00 AM – 10:00 AM — Check-in & registration Arrive, check in, get settled, and set up your workspace.
10:00 AM – 10:30 AM — 🚀 Opening ceremony Welcome to Hacktoberfest Mumbai — the theme, the challenges, the format, and what you'll be building.
10:30 AM – 1:00 PM — 🔨 Hacking session I Start building. Code, experiment, collaborate, and turn your idea into something real.
1:00 PM – 2:00 PM — 🍕 Lunch break. Take a break, grab some food, and network with fellow builders.
2:00 PM – 3:30 PM — ⚡ Hacking session II Back to building. Polish your project, fix bugs, add features, and get your contribution ready.
3:30 PM – 4:00 PM — 🎤 Live demos & judging Show what you built, share your progress, and walk everyone through your project.
4:00 PM – 4:30 PM — 🏁 Results
Challenge winners announced.
4:30 PM – 5:00 PM — 👋 Networking, wrap-up & exit
Final announcements, photos, networking, and closing the event.