Signal Speakers has extended their Early Bird registration deadline, allowing attendees to take advantage of a discount. The event features a variety of speakers, including Lea Culver, who will discuss using Dropbox in 3rd party apps, and Doug McKenzie, a magician who incorporates Twilio code into his show. Another speaker, Jimmy Jacobson, will talk about scaling social polling with Twilio SMS, while Patrick McKenzie will share insights on bootstrapping a business that helps manage inbound communication from various channels. The event aims to bring together professionals interested in communication and technology, with the blog providing updates on Signal announcements and more.