Thanks for coming to our hands-on introduction to Web Components & Polymer! If you stumbled onto this and weren't at the event, hopefully this is still of somewhat use :-)
This is a sample react app to show integration of Web Components.
Hacker News PWA with react - Hosted version https://reacthnsuriel.firebaseapp.com/
git clone [email protected]:ComcastSamples/reacthnpwa.git
cd reacthnpwa
npm install
npm start
Make sure you have the shared components setup from https://github.com/ComcastSamples/wc-components