Minecraft wiki entry for mobevent, associated text: Specifies the event(s) to control or query. Can be one of the following:
minecraft:pillager_patrols_event for the event that generates an illager patrol,
minecraft:wandering_trader_event for the event that spawns a wandering trader,
events_enabled for the event subsystem. When this is disabled, no events occur; when enabled, only enabled events occur.