Besides opening and closing sessions and paired 1-on-1s, nothing is mandatory. Just go to what you think will be useful!
We've differentiated between the things we recommend more and things we see as optional.
However, everything is truly optional! You should feel free to go take a nap, go on a walk, or have a one-on-one instead of attending some of the optional sessions. Do whatever is most valuable for you.
You can add a Google Calendar with these events and locations!
Have a question? Contact the organizers here.