Your view (showing concurrent sessions), with Mitchell's functionality (show/hide abstract; add to calendar) would be the sweet spot for a schedule. Ideally a link to the live feed or recorded video would be perfect, with share buttons to send interesting talks to colleagues.
The app does a pretty good job of most of these functions, though some people probably aren't aware that anyone can use the app, even if not a paid attendee? I found it almost by accident - search rstudio in your app store.
EDIT The app can also be accessed by browser - [https://event.crowdcompass.com/rstudioconf2020](http://app link to view in browser)
Ideally I guess the agenda website which lacks many of these functions, could (should?) give you a hint that there are alternative methods?