This Event is emitted in the context of a Resource. It is intended to activate when the user interacts with or sees the implementation of this Resource. For example, the Open Event will be called for Screen Message when the message appears on the screen; or for Media when the Media Item begins playing.
Although it is best-practice to include it, this Event is not guaranteed to be emitted. This depends upon the implementation of the app. Project templates downloaded from Motive.io will emit it.