If they're close-minded, there won't be any getting through to them. You cannot change a closed mind. If they're open-minded enough, fine, their horizons will be broadened; however, if their minds are so closed up to only those things that they like and they won't allow any room for something different, then the heck with them, they shouldn't go to a convention and keep complaining. There will always be others who will go because of the word of mouth that gets to them from those with open minds.