Apache DataFusion Meetup in Chicago was attended by around 25 enthusiasts who learned from project contributors and discussed ideas for the future, showcasing increasing adoption of the technology. The event featured four talks on various topics, including building a real-time data lake with DataFusion, practical data science in robotics using DataFusion, a disaggregated cache for DataFusion, and building InfluxDB 3.0 with the FDAP stack. The meetup also provided opportunities for attendees to meet others from companies like Pydantic, Relativity Software, and Embucket who are working on projects using DataFusion, fostering a sense of community and discussing topics such as project growth, secondary indexes, performance, and the future roadmap.