Thoughtless people at a tribute band concert,

You don't mention their ages but I assume younger than you. It seems these days people are often very selfish, or maybe I was just brought up to be polite. They showed no consideration for you, presumably older folk, enjoying the concert. Just appalling. Where were the organisers? Maybe one of you should have gone to find whoever was 'on the door' and asked for help. You should certainly complain that this was allowed, especially as you paid more for your tickets. Maybe they will give you a partial refund? Make it clear your enjoyment was ruined and how disappointed you are (don't be afraid to exaggerate!)