Conference rooms are built big. Like in hotels, or conference centers.
But not everyone wants a big room if they only have 100 people in the audience. And they don't want to pay for a room that can hold 600 people, when they are only gonna be clumped up in like 1/3 of the room or whatever.

So conference rooms are built in a way they can be subdivided. By airwalls.
Next time you are at a conference, look for tracks in the ceiling. Like a metal channel with a slot running through it.
Or look for a wall made up of 1m sections.
That's airwall track & airwall.
You run them along the track until they hit another bit of wall, stick an Allen key in the end of them, and wind down a soundproofing seal that also locks the wall in place. Then you run out another, and so on, until there is a wall.

Where the track meets the actual room walls, there will be additional tracking and full height doors that allow the wall to be manoeuvred and stored