add_tournament_contest_contestant_effect

add_tournament_contest_contestant_effect = {
	save_scope_as = new_list_member
	# Add to subset
	scope:activity = {
		add_to_guest_subset = {
			name = qualified
			target = scope:new_list_member
			phase = tournament_phase_$CONTEST$
		}
	}
	# Update stats
	set_variable = {
		name = contest_aptitude
		value = contest_$SKILL$_aptitude_value
	}
	set_variable = {
		name = progress_to_victory
		value = $PTV$
	}
	# Toast
	if = {
		limit = {
			scope:activity = { has_current_phase = tournament_phase_horse_race }
		}
		send_interface_toast = {
			title = tournament_qualify_title
			left_icon = scope:new_list_member
			custom_tooltip = tournament_qualify_race_desc
			play_sound_effect = "event:/SFX/Events/Themes/sfx_event_theme_type_martial"
		}
	}
	else = {
		send_interface_toast = {
			title = tournament_qualify_title
			left_icon = scope:new_list_member
			custom_tooltip = tournament_qualify_desc
			add_prestige = minor_prestige_gain
			play_sound_effect = "event:/SFX/Events/Themes/sfx_event_theme_type_martial"
		}
		if = {
			limit = {
				OR = {
					this = scope:activity.special_guest:special_guest_champion
					has_court_position = champion_court_position
					is_knight = yes
				}
			}
			liege = {
				add_to_list = qualification_liege_list
				add_to_variable_list = {
					name = qualified_knights
					target = scope:new_list_member
				}
			}
		}
	}
}

As written in game/common/scripted_effects/04_dlc_ep2_tournament_effects.txt.