In today’s world of connected cloud-centric applications with rich user experiences, the need for asynchronous and event programming is bigger than ever. With the C# and Visual Basic language features added to .NET 4.5, an imperative approach to sequential composition and orchestration of asynchronous operations has been introduced. Come and learn how the Reactive Extensions (Rx) complement this feature set, adding the notion of multi-value asynchronous observable sequences with full-fledged LINQ support. In this demo-intensive session, we will sketch out the asynchronous and event programming landscape, and dive into the unique role played by Rx. After explaining the design philosophy of Rx and its layered architecture, we will cover the rich set of query operators that enable complex event processing. Next, the synergy between Rx and the TPL functionality is discussed, also touching upon leveraging Rx from Metro-style applications. Democratizing event processing starts today!