What examples did you have in mind? The only cases that come to mind are Belgium and the Netherlands if Germany invades. In both those cases there are events that fire for the respect countries (called "The Belgian Capitulation" and similar for Netherlands) where they secede those provinces to Germany. There are a number of other events which involve this, although they generally involve events for both sides so it is more obviously event based (Anschluss, Sudetenland/Czechoslovakia, Memel, Vichy, Denmark, BP and so on)