tournament_give_trait_effect

tournament_give_trait_effect = {
	if = {
		limit = {
			save_temporary_scope_as = new_list_member
			scope:activity ?= {
				any_guest_subset = {
					name = qualified
					phase = tournament_phase_$CONTEST$
					this = scope:new_list_member
				}
			}
			NOT = { has_trait = tourney_participant }
		}
		hidden_effect = {
			random = {
				chance = 50
				modifier = {
					is_ai = no
					add = 50
				}
				modifier = {
					scope:contest_winner ?= this
					add = 100
				}
				modifier = {
					scope:activity ?= {
						any_guest_subset = {
							name = winner
							phase = tournament_phase_$CONTEST$
							this = root
						}
					}
					add = 50
				}
				modifier = {
					scope:activity ?= {
						any_guest_subset = {
							name = second_place
							phase = tournament_phase_$CONTEST$
							this = root
						}
					}
					add = 30
				}
				modifier = {
					scope:activity ?= {
						any_guest_subset = {
							name = third_place
							phase = tournament_phase_$CONTEST$
							this = root
						}
					}
					add = 15
				}
				add_trait = tourney_participant
			}
		}
		if = {
			limit = { has_trait = tourney_participant }
			show_as_tooltip = { add_trait = tourney_participant }
		}
	}	
}

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