Why will some one be bit? Anything can happen with dogs but I'd hope the people doing this would have common sense to use good temperament, socialized dogs.
Saint's I can see being fine with the people and music. Well bred Saint's, EM's and Newfies all are extremely great dogs in large loud crowds as long as correctly socialized. My biggest issue is the heat, none of the dogs stated deal with high heat well.. It takes a lot of water, rest and a cool down area for them, and close monitoring of them. I see to many issues that could happen, and only the poor dogs will be held accountable.
Nope. Bad job for any dog. Too many crazy people out there either fear dogs or dislike dogs or want one so bad they'll steal it.