Our chapel has cleaning groups. The groups rotate week to week and when your group comes up (about once a month), each of the three people in the group cleans one area of the chapel/hall/classrooms. I doubt the whole group shows up at the same time, but possibly they do. On occassion, I see someone stay until after everyone has left the chapel on Sunday in order to do their cleaning before they make the trip back home.
When a new person is needed to fill a void, an announcement is placed in the bulletin. I'd imagine such meets with average success, but the announcement generally disappears again after a few weeks, so I guess the groups stay full. I've never been in a cleaning group so I only know what the bulletin tells me.