@Linkat,
I guess I would.. upon reflection.. talk at a quiet time with whomever is the top dog conferencer about the distraction, not in my well known snappish way, but nicely, nicely.
I used to deal with this somewhat, in that seven of us worked in one big room, and pretty much got along over time. Sometimes there was a lot of laughter from one part of the room when another person or two was trying to get out of work before midnight, stressing on a rush project with complications. Like me, project manager for some thickets. I used to go over and explain (sometimes) or just call out, hey, pipe down a bit. Usually the more senior of those cackling away could relate to the need for quiet, and help to tampen the volume down.
This is all tricky, as I like to talk and laugh as much as anyone else. It's really a matter of sensitizing the less tuned in re projects going on in the room. Work breaks and laughter can be a good thing, too.
Anyway, that wasn't a routine. What would drive me nuts about linkat's situation is the repetition of it.