Game concept · All Under Heaven
Mandala Ritual
The game also links it as Mandala Rituals, Ritual, Rituals.
From the game's encyclopedia
Mandala Rituals are tasks that appear occasionally for Mandala Rulers — it is a sign that a particular part of your Realm is in need of your guidance and divine uplifting.
Being more skilled in your Mandala Aspect will increase any gains from making appearances for your Subjects.
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.
Mandala Ritual is an entry of Crusader Kings III's in-game encyclopedia (All Under Heaven). The game explains it: "Mandala Rituals are tasks that appear occasionally for Mandala Rulers — it is a sign that a particular part of your Realm is in need of your guidance and divine uplifting." It is part of Contract. It covers Mandala Ritual Tier. The game also links it as Mandala Rituals, Ritual and Rituals. Patch 1.20.1.2, from game/common/game_concepts/tgp_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/tgp_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.