Joining Twilio at Cloudstock offers a variety of engaging activities for developers, including talks, hackathons, and networking opportunities. The event features presentations from industry experts on topics such as lead generation, sales analytics, SaaS business models, API development, and more. Participants can also showcase their skills by registering their hackathon projects and competing for prizes, including the ReadWriteWeb Data Visualization Award. Additionally, attendees are invited to a free party at Twilio HQ, while those with a Cloudstock badge or who email [email protected] with their account details can gain entry. Furthermore, Twilio hosts a developer contest with a deadline of December 12th, and offers resources such as API documentation, SDKs, and webinars to support developers in building communications and digital engagement experiences.