Trying to find the right video is a bit painful at the moment through the recorded livestreams - no labels, some short snippets, not starting at the start etc. Ideally the individual videos would be available to be linked through via a site like Emils?
Also, Grand Ballroom B has no recorded videos available at the moment...
Update, Feb 2020 Now all available at https://resources.rstudio.com/rstudio-conf-2020