Top 5 things I'm currently interested in learning more about:
Scaling Web Applications
Client side performance tuning
I have a good amount of professional experience at this point working with modern FE tooling and building single page apps using Webpack/React/Redux, so those would be interesting things to talk about.
I'm also very interested in leveling up my functional programming skills. I have a pretty good grasp on fundamental functional programming techniques, so I'm starting to move into more intermediate territory and enjoying the ride.