What I've always found to work is this. As soon as the concert starts, tell him to be quiet, and stick something edible in his mouth. Preferable something that's difficult to spit out, and that he likes really well. I use peanut butter or Cheese Whiz. Yes, it's messy, and it means carrying a jar around, but he has to shut up to eat it.
After a few times of immediately putting something tasty in his mouth, tell him to be quiet and wait. He'll probably look at you, expecting a treat. If he does, give him the treat and praise him. If he doesn't, just put the treat in his mouth a few more times, then try pausing between the command "Quiet" and the treat. Once he gets it, and stops fussing and looks for the treat, lengthen the amount of time, and start just praising instead of giving the treat every single time. Offer treats occasionally, but not every time, but do praise him when he controls himself.
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