madlib, you can't imagine my disappointment! I was sure you would post on the growing problem of patrons talking aloud in libraries!
But while I sulk (kidding), I just want to point out that I started this discussion by arguing against talking during a show. You'll get no argument from me as to how I should behave during a show to avoid disturbing you.
I can think of some things that might help further: asking for front-row seats, putting together a group and buying an entire theater box, using the headphones that most large theaters now have for hearing-impaired patrons. Some theaters even have glassed-in booths that are used by people working on the show. You probably know more about this than I, but theaters where I have worked are very sensitive to compliance with ADA requirements. If you don't already, ask what they can do for you.
Speaking of which, do you think you have a right under the ADA to be free from distraction during a public event? If yes, would that right apply to sports events and stadium rock concerts? My personal experience with ADA rules is that they are rarely a hardship once people stop bitching and just put their minds to achieving compliance. But I must admit that achieving a distraction-free space at a public event is a head-scratcher for me. (To be clear, I'm not saying you DON'T have such a right; I'm saying I'm not sure how to achieve it beyond the examples I listed above, which are admittedly imperfect.)
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Bottom line: I know I may seem to be arguing a paradox here, but I'm not. I think each of us should do what s/he can to avoid disturbing others in the audience, while simultaneously remembering that we are in a public space (i.e., like the subway) and perfect immunity from distraction probably isn't possible. (The exception to the above may be those with special needs, such as madlibrarian.)