When I was a MS, sometimes I'd be an attendant. It was easier just to stay in the back and stay, to help latecomers find seats or to be ready for whatever was needed. However much of the time I and other MS would just stand around because we'd get tired of sitting. Sometimes during the Thur nite meeting we'd take turns taking naps in the supply closet. Sometimes just as the School was about to start I'd be asked to do a substitute talk. So I'd stand at the literature counter and work on it during the first couple of parts.
Since we were MS, no one questioned what we did. If a "publisher" were to be standing around during a meeting, you know the attendants would be asking him what's wrong. The publisher would be expected to provide an explaination (back ache, etc).