Been judging for a while now (KCBS, MBN, and North Carolina Pork Council) and just wanted to say that I'd never visit with a cooking team the day of the competition - before the competition! A curteous "Hey!" or something is acceptable, but no detailed discussion of their meat, cooker, technique, or anything else is right.
Just my two cents. Those who do "fraternize" give the rest of us a bad name. I've never been able to tell one team's Q from another as they do a GREAT job in concealing the identity of the teams on the boxes.