Badger Build Fest Madison, WI, USA Badger Build Fest is a 24-hour half-hackathon half pitch-competition where participants choose between Venture and Blockchain tracks to build the next big thing. $6,000 in prizes Nov 15 – 16, 2025 94 participants
OpenAI Open Model Hackathon Online Build with gpt-oss, OpenAI’s open weight reasoning models. $30,000 in prizes Winners announced 8655 participants
