They do a couple of meet and greets a year the last one was with killswitch engage on may 9th of last year at the des moines tour for music as a weapon. Disturbed's meet and greet had a lot of rules: 1. No personal contact in any way - no handshakes, nothing. 2. Do not take photos with our personal camera, 3. Do not have long conversations, 4. Do not step beyond the table where they sat, and 5. No more than one autograph. Their main reason for the rules was the amount of H1N1 and other sickness that was going.
As for height david is 5'6 don't know the other height but im sure they are taller than david.