For that matter: Tech, the day when everyone who has been rehearsing, making mistakes, trying things and otherwise learning the show expects the SM to be perfect on our first rehearsal/first try calling a show from a totally different angle, listening over a monitor system and interacting with board ops plus the added components of lights, sound, fly, SFX and QC.
Or, SM assumes all blame for late cues that ran behind cuz the LD/ SD/ etc were fixing and didn't complete by the standby/Go