I've volunteered with FIRST every now and then when I'm able to.
The phrase "gracious professionalism" always struck me as both condescending to the contestants and unnecessary.
We have the perfectly good term "sportsmanship" which means pretty much the same thing. At various other robotics competitions (BattleBots, Robot Battles, etc.) nearly everyone I've met has been a good sport, and likeable too. Going on and on about "gracious professionalism" at the various official functions implies that the contestants are unable to figure it out on their own and thus need to have it drilled into their heads.