I was riding on a horse-drawn sleigh in the moonlight and singing Lenski's aria from Tchaikovsky's opera "Eugene Onegin", and I survived. It is the highest fee I have ever been paid for one song. (on passing Soviet snipers unharmed in the 1939 Winter War)
A performance is not good if there is no stage fright. One just has to select the right time for it -- either just before or right after the performance, but preferably not during it! Getting the timing right is difficult, but one can learn it.