IFAC World Congress
I just returned from the 2017 IFAC World Congress in Toulouse, France. It was a massive conference (over 3400 people)! The passivity-based control session was a highlight. The 'interactive sessions' where presenters had big screens and could present their work however they wanted were pretty great. Some presenters did what amounted to informal presentations where they could jump to movies, simulations, etc... It was a great way to learn about peoples' work, and a big improvment over your typical poster session.