A product owner attends a session with the team and other key stakeholders to review an illustration of the deliverable generated. What is the frequency of this type of discussion when following an iteration-based Agile view?  

This question describes an iteration review meeting, which can go by other names such as sprint demo. The intent of the meeting is to review the working product to obtain feedback directly from the product owner and other key can be made. In iteration-based Agile, this meeting is held at the end of a sprint/iteration, whereas flow-based Agile encourages reviews to occur at least once every two weeks.