I remember one of the first times this happened. I was new at running monitors and was attempting to amplify this performer s whisper vocals. The performer kept asking for more voice and more voice. The times this has happened in the last ten years come rare and the compliments far outweigh the angry performers. You will forget to power something up, plug something in, or turn a channel on.
Many days go by hour after hour gig after gig, things tend to become monotonous.
Alternatively, the easiest parts of your gig become the most difficult sometimes. Some examples of this are, swapping the monitor snake into the FOH hole in the stage box, running power to the SR house amps and not turning them on, patching twelve Mic cables into a sub box and not twisting the other end into the stage box, not turning the insert button on and not replacing the batteries on the wireless during the intermission. Someone will tell you how to do your job. This is not always the most offensive thing to happen in one day. Although the term creative director can mean many things, it does not say sound engineer.