I remember my voice teacher telling me how she would pay for a ticket either in the orchestra standing room or family circle standing room, then walk to the front and look at the orchestra pit acting like she never saw something like that before and using it as a way to find an open seat. And, JUST as the lights were going down, she would grab an empty orchestra seat.
NGeorgiaBwayFan, I had a similar situation to you awhile back. I went to see Boheme at The Met and there was an understudy on for Mimi. Apparently there were a couple of opera buffs who went to see the lead and were upset that she wasn't on. When I stepped outside for a smoke they gave me their tickets when I told them that I was in SRO. Despite telling him that I only needed one he said take two and give it to someone else who is standing.
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Tom Stoppard's Rock N Roll