q: i've never attended such a conference. when the users move from room to room they would have to reconnect to another SSID ? or did you setup something like a mesh setup ?
No Mesh magic involved. Just set them all to the same SSID and it will magically work.
this would only work if you aren't using encryption, like in your case ? (or encryption won't change a thing, except a lot heavier on CPU and there goes all down the drain)