The Replit x Weights & Biases Machine Learning Hackathon was a global event that took place from February 4-11, 2023, where participants from all over the world worked on machine learning projects using both custom models and fine-tuning existing ones. The hackathon provided resources, mentorship, and a platform for collaboration, with expert ML engineers judging the submissions to award prizes worth over 500,000 Cycles. The winners were announced, including @NirantK's proof of concept project that used LLMs with Python to scale human effort, @vertinski's Zen Master GPT project that generated synthetic kōans on-demand, and @codingMASTER398's Grand Prize-winning project that combined the best features of both Weights & Biases and Replit to detect filters in new images. The closing ceremony was live-streamed on YouTube, and the event concluded with a thank you to participants and sponsors.