Because the event is written like that. When the engine reads the Conditions section of the event and game date is outside min/maxdate, it will not execute it.
So, no, it will not appear anymore, unless you alter file USA Events.sct or write an own event.
Blood and Thunder Brigade wrote:So I'm assuming that if he hasn't appeared by MaxDate = 1861/06/30 he isn't appearing at all? If so, why?
Sadness abounds in July 1861 in New York City for there will be no future Carl Schurz Park along the East River in Yorkville (Manhattan's Upper East Side). https://en.wikipedia.org/wiki/Carl_Schurz_Park