Pivotal Labs hosted the React Toronto Meetup this month.
Rohan Nair talked about error boundaries in React 16 which can stop an uncaught exception from making your whole tree of React components unusable. Slides and another link to something on GitHub
Varun Vachhar talked about simplifying compositions of higher order components by squashing their functionality them into 1 component. This can make debugging simpler Slides
Erich Reich talked about Realm as an alternative to Redux in React Native applications. Slides