@futurebird
Of course, in that setting, there are several "helper instructors" who can go and troubleshoot while the main instructor continues the presentation... Not sure the post-its by themselves will solve things ‍️

@futurebird
In Carpentries instructor training, they teach you to handle this by giving everyone two colors of sticky notes. You have the students put the green note sticking up like a flag on their laptop when things are going well, and the red note when they are dealing with a problem and need help.
Works very well in the context of Carpentries workshops!