Cast members that are new to an existing show are rehearsed in a studio by stage management, a resident director (if there is one), the dance captain and someone from the music staff. They are usually rehearsed with other incoming cast and/or understudies and swings from the current cast. On stage they get only one "put-in" rehearsal, which is a run-through of all their parts with technical elements (usually) and their costumes - with the current cast (who are not in costume). In terms of not running into people, performers have to hit their marks, sometimes indicated by spike marks on the floor, or by following numbers that are on the front edge of the stage. (that would be just as important in something like Dear Evan Hansen, mostly for lighting considerations) Incoming performers usually have the chance to watch the show from the audience and take notes as well. They'll also get a chance to track the performer they are replacing - by following them backstage during a performance, to see what they do offstage (ie. where to change, where to stand to not get run over by a set, etc.). Most likely they will also be given a written up version of the track which they can study.
In terms of what show is the most complex to stage manage, that somewhat depends on what stage management position you are talking about. A SM calling the show, is different then the ASM supervising a busy backstage area. ie. Come From Away has a billion lighting cues, Lion King has extensive backstage traffic & choreography, etc. Spiderman was probably one of the more complex shows in recent memory.
Updated On: 6/22/18 at 12:28 AM