Construction script blueprints happen as soon as an actor exists, or when one of its properties are updated, or when it is spawned at run time. This is useful for setting up dynamic textures or setting random rotation to meshes at the beginning of their lives. These things show up as soon as you place them in the editor. The construction script fires only at the beginning of an actor's life.
Event Graphs do not happen until the event fires. Event graphs can happen as often as you like, for as long as you like.
Blueprints Information by Thomas Harle
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