Event modding (Crusader Kings III)

https://ck3.paradoxwikis.com/Event_modding

Events do not fire automatically; they are called from on_actions, decisions, or interactions. Structure: trigger, immediate, options with ai_chance, after. on_actions fire events, weighted random_events, or first_valid; trigger_event schedules follow-ups with random day delays; warns against every_living_character in pulse on_actions.

Crusader Kings III, Triggered event chains