The second day of Signal, a code carnival event organized by Twilio, featured a range of activities including developer toy boxes, hackathons, and talks on building software, with attendees including developers, entrepreneurs, and industry experts. The event aimed to support the developer economy through TwilioFund, a $50 million investment fund focused on attracting new businesses to build on Twilio's platform. Notable speakers included Harper Reed, Eric Ries, and Justin Kan, who shared their experiences building software and what makes a successful builder. The evening also featured an interview with They Might Be Giants, a legendary rock group that uses communication technology in its music, including the new Dial-A-Song powered by Twilio. Overall, Signal was a unique experience that brought together the developer community, inspiring attendees and showcasing the power of innovation.