activity_is_valid_tournament_contestant

activity_is_valid_tournament_contestant = {
	involved_activity ?= { has_activity_type = activity_tournament }
	is_alive = yes
	is_adult = yes
	is_imprisoned = no
	# Exclude clergy who don't fight
	clergy_can_fight_check_trigger = yes
	# Has not opted out
	NOR = {
		has_character_flag = tournament_not_competing
		is_in_guest_subset = { name = spectator }
	}
	trigger_if = {
		limit = {
			involved_activity = {
				NOR = {
					has_current_phase = tournament_phase_horse_race
					has_current_phase = tournament_phase_board_game
					has_current_phase = tournament_phase_recital
				}
			}
		}
		# Only martial sex competes
		can_be_combatant_based_on_gender_trigger = { ARMY_OWNER = involved_activity.activity_host }
		NOR = {
			has_trait = wounded_2
			has_trait = wounded_3
		}
	}
	# Mulan is clever enough not to reveal themselves
	trigger_if = {
		limit = {
			involved_activity = { has_current_phase = tournament_phase_wrestling }
		}
		NOT = { has_character_modifier = ignores_gender_army_rules }
	}
	NOT = {
		has_trait = incapable
	}
	trigger_if = {
		limit = {
			NOT = {
				involved_activity = { has_current_phase = tournament_phase_horse_race }
			}
		}
		NOR = {
			has_trait = blind
			has_trait = infirm
		}
	}
	trigger_if = { # Blind and maimed people don't do archery
	    limit = {
	        NOT = {
	            involved_activity = { has_current_phase = tournament_phase_archery }
	        }
	    }
	    NOR = {
	        has_trait = blind
	        has_trait = maimed
	    }
	} 
}

As written in game/common/scripted_triggers/04_ep2_tournament_triggers.txt.