In what sports is it traditional to shake hands with (or otherwise congratulate) the officials - generally for a “job well done” - usually after the event?
Tennis - both players (in a singles match) at least touch the hand of the Chair Umpire after a match. I’m not sure about doubles - do all four players follow the protocol?
Soccer - after a game, don’t the players usually shake hands with the head referee?
I can’t imagine baseball players congratulating the home plate umpire after a game.
Hockey, North American football - same thing.
Other sports?