Based on the information given the formal event in which this is dome is :Product backlog refinement.
Product backlog refinement can be defined as the process in which the development team tend to understand a product as well as how the product should be prioritize.
Product backlog refinement is important as it help to increase efficiency when planning for the next sprint and it as well help the development team to have full understanding of what the outcome of the product will be.
Inconclusion the formal event in which this is dome is :Product backlog refinement.
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