Concerts have to be seen as a real event for which the aim is to try and feed everybody.
Peace congresses often start by dealing with some of the less important questions in excessive detail, so at the end there is no time to discuss the most important problems.
There is no reason for anyone in this country, anyone except a police officer or a military person, to buy, to own, to have, to use a handgun... and the only way to do that is to change the Constitution.