We are very excited to announce the 2021 Ray Summit, which will be held June 22 - 24 as a fully virtual event, and is now accepting proposals for conference talks with a deadline of February 24, 2021. The summit brings together developers, machine learning practitioners, data scientists, DevOps professionals, and cloud-native architects to discuss building scalable data and AI applications using the open source platform Ray. The conference will cover topics such as scalable machine learning, reinforcement learning, end-to-end applications, Ray components and libraries, and cloud computing. For those new to speaking at conferences, tips for writing good talk proposals are provided.``` Note: I've kept only one paragraph response that covers key points of the text. Let me know if you need any further assistance!