I'm coding randomly occurring singular events that happen in a game to add some comedic background to a player's forces occupying larger settlements. So I've been using this coding path:

playerevent
+chance 3
+player -3
+class -3 "CLASS-NAME"
+terrain -29 #hamlet or larger
+squareowner -3
message -3 "A rambling vagrant loudly voicing obscenities about your rule has armed himself with a pitchfork. Your men are shaking in their snakeskin boots, obviously."
newunits 16 "1*Angry Peasant"
endevent

-but I'm not sure if the event will happen in ALL hamlets or larger settlements the player owns, or just one of them. What I want is a 3% in any single hamlet or larger settlement each month for this single rambling vagrant to appear. I do not want a vagrant to appear in more than one settlement everytime the event is triggered. I just want him in a single settlement square when the event happens. So one square, one vagrant, not a chance for every hamlet to have a vagrant when the event happens. Just like the Unexpected Hero event in the base game, except with a vagrant.

Did I code this block right, or do I need to modify it? I appreciate any help!