I think my emotional revulsion against Stalin's terror would have stopped me in my tracks.
No matter what - rehearsed, under-rehearsed, over-rehearsed, doubts about rehearsing - the first gig is always the first gig, and you put on your little praying hat, batten down the hatch, and do what you do.
I think we must quote whenever we feel that the allusion is interesting or helpful or amusing.