start_adventure_effect

start_adventure_effect = {

	#To save the location so we can use it in the effect checking the distance
	set_adventure_distance_variable_effect = { # Figure out how far it is there
		ADVENTURER = $ADVENTURER$
		DESTINATION = $LOCATION$
	}

	$ADVENTURER$ = {
		# Set a variable to check for availability 
		set_variable = gone_adventuring

		# Set up the event cycle
		# To trigger the event that progresses the inspiration
		trigger_event = {
			id = fund_inspiration.0053
			days = 1
		}
		# Fallback to make sure the inspiration is handled somehow if it goes on for too long
		trigger_event = {
			id = fund_inspiration.0054
			years = 10
		}
	}
}

As written in game/common/scripted_effects/00_adventure_effects.txt.