hosted_successful_feast_new_effect

hosted_successful_feast_new_effect = {
	# Renown gain from Tradition.
	if = {
		limit = {
			culture = { has_cultural_parameter = renown_from_feasts }
		}
		dynasty ?= { add_dynasty_prestige = minor_dynasty_prestige_value }
	}
	# Piety gain from Tenets.
	if = {
		limit = {
			rite = {
				OR = {
					rite_has_parameter = piety_from_feasts_active
					AND = {
						rite_has_parameter = summer_festivals_active
						# Only during 'summer' (May 1st through July 31st).
						current_month >= 5
						current_month <= 7
					}
				}
			}
		}
		add_piety = {
			value = 0

			if = {
				limit = {
					rite = { rite_has_parameter = summer_festivals_active }
					# Only during 'summer' (May 1st through July 31st).
					current_month >= 5
					current_month <= 7
				}
				add = major_piety_value
			}
			if = {
				limit = {
					rite = { rite_has_tenet = tenet_ritual_celebrations }
				}
				add = medium_piety_value
			}
			if = {
				limit = {
					rite = { rite_has_tenet = tenet_hedonistic }
				}
				add = medium_piety_value
			}
			if = {
				limit = {
					has_royal_court = yes
					has_dlc_feature = royal_court
					amenity_level = { target = court_food_quality value >= 5 }
				}
				multiply = 2.5
			}
			else_if = {
				limit = {
					has_royal_court = yes
					has_dlc_feature = royal_court
					amenity_level = { target = court_food_quality value >= 4 }
				}
				multiply = 2
			}
			else_if = {
				limit = {
					has_royal_court = yes
					has_dlc_feature = royal_court
					amenity_level = { target = court_food_quality value >= 3 }
				}
				multiply = 1.5
			}
			else_if = {
				limit = {
					has_royal_court = yes
					has_dlc_feature = royal_court
					amenity_level = { target = court_food_quality value >= 2 }
				}
				multiply = 1
			}
			else_if = {
				limit = {
					has_royal_court = yes
					has_dlc_feature = royal_court
					amenity_level = { target = court_food_quality value <= 1 }
				}
				multiply = 0.5
			}

			# Always give some piety, even if you completely cheaped out.
			min = medium_piety_value
		}
	}
	# Musician opinion bonus
	if = {
		limit = {
			court_position:court_musician_court_position ?= {
				is_physically_able = yes
			}
		}
		court_position:court_musician_court_position = {
			save_scope_value_as = {
				name = musician_opinion_bonus
				value = {
					value = "aptitude(court_musician_court_position)"
					multiply = 5
					if = {
						limit = {
							culture = { has_cultural_parameter = characters_are_better_court_musicians }
						}
						add = 10
					}
				}
			}
		}
		scope:activity = {
			add_activity_log_entry = {
				key = court_musician_increased_opinion_tt
				character = root.intent_target
				score = 100 
				show_in_conclusion = yes

As written in game/common/scripted_effects/00_feast_scripted_effects.txt.