I feel like there's a decent amount of people who've been in touch with React, but GraphQL might still be a bit new to many people. In a presentation I'd illustrate that GraphQL is like a REST API but you determine exactly what you need from the API instead of the REST API giving you an overload of information you're never going to use. For React, I don't know much about it myself but not sure you need to explain a whole lot about it? The highlight on their site is: "Create user interfaces from components" - sounds good to me. 🙂