Here's another one using a sophisticated combination of sound and light as a network communications method ...
1. The chairman has a mobile device (phone, for example) app that has the agenda on it in a selectable list. Once pressed, a particular agenda items' text representation is then sent through the devices' speaker (which, depending on the size of the room, attendees, etc. may need to be routed through an external sound wave amplification device ... but, if properly modulated, shouldn't affect the next part) to the board members.
B. The board members have another app (could be the same app but different screens, aka 'activities' than the chairmans) that will be waiting to receive that agenda item to be voted on in sound wave form from the chairmans' app. It will convert that to readable text so that the board member can read it. Or just route it through the speaker to their bluetooth connected earplug.
III. To initiate the vote, the same thing happens above. The chairmans' app gives a signal wave form from the speaker - the board members' app picks that up and signals the board member to press a button on their app for their vote.
d. For the information to be passed back to the chairman, the board members' app gives a visual indicator (a color / emoji / different flashes / whatever) on the screen that the chairmans' app is looking for (think: red light cameras or license plate readers technology). Of course, the chairmans' device would probably have to be positioned so that it could receive, accurately, the information from all of the board members. I have some ideas on how that could be achieved in a most excellent, cool way, too. Also, the board members would need to make their own devices visible to the chairman in some way, too. Hmmm, maybe have them, position their devices on some sort of skeletal-like extendable pole (it'd need to be reinforced with a sort of support fibers in order to do the extending / retracting I suppose). Again, I have ideas on how that's achieved ... very organically (modern business still likes that word? or is it too 00's?). Once the vote tally for that agenda item is made, then the same sort of communications methods can be performed to signal that the apps are ready for the next agenda item/vote.
Anyway, that's just a quick outline. Based on quite an old idea, of course, but it has seemed to work for millennia.