When the event is 100% based upon enjoying sound this should not be tolerated regardless of age or IQ. 10 years ago, when I took my daughter to these concerts and she would start to act up I removed her from the theater and took her to the lobby until she shut up.
The artists for these concerts don't make the mega-bucks like the normal screech and dance trash and usually just get paid enough for expenses plus a little. Many of the artists are my friends and I know most are paid under $1,000/concert.
I agree. I was suggesting (for example) a separate performance for the handicapped and/or children, if the performer wished to make the effort.