Game concept · Advanced Activities
Tour the Grounds
The game also links it as Touring the Grounds, Tour of the Grounds, Tour Grounds.
From the game's encyclopedia
An Activity Phase during a Royal Tour in which a Vassal is visited by their Liege, which often results in an increase in Control in their Counties.
The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.
Tour the Grounds is an entry of Crusader Kings III's in-game encyclopedia (Advanced Activities). The game explains it: "An Activity Phase during a Royal Tour in which a Vassal is visited by their Liege, which often results in an increase in Control in their Counties." It is part of Tour. The game also links it as Touring the Grounds, Tour of the Grounds and Tour Grounds. Patch 1.20.1.2, from game/common/game_concepts/04_ep2_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/04_ep2_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.