I would add this advice:
Please speakers, do not stay inside the speakers room for most of the day...
That one is admittedly really hard. It's not because we want to hide away. It's normally because we're tweaking a talk in silence or need to finish other work.
But it should not be the default for sure.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.