The Twilio Meetup event featured various demos from hackers showcasing their projects, including Songsicle for musical greetings, Cnvrge for networking, Stormpocalypse for tracking power outages, and a karaoke app built live by Twilio Developer Evangelist Rob Spectre. The event was attended by the NYC Twilio community and provided an opportunity for attendees to learn about new projects and connect with like-minded individuals.