MCAA is the Masonry Contractors Association of America. The Fastest Trowel block laying contest was held at WOC.
M.E.T is a masonry supplier in Australia. This guy was there to cheer on Ron Eliot, an Australian mason who competed in the Bricklayer 500.
Part of the cheering section for Dave Moyle, a competitor from Sumner, Iowa. The Pope's endorsement didn't help, because this year Moyle failed to make the podium.