The second day of Signal, a Twilio conference, featured a mix of activities including hackathons, talks on software development, and interviews with notable figures such as They Might Be Giants. The event aimed to support the developer economy by relaunching the $50 million investment fund TwilioFund, which focuses on attracting new developers and businesses to build on Twilio's platform. The conference also showcased the creativity and ingenuity of attendees, who were encouraged to bring their own projects to showcase and win prizes. Overall, Signal was a unique experience that brought together people from the developer community in a fun and inspiring environment.