Assume you are a concert and pop-up event promoter; the best measurement method would be audience analysis.
A promoter is a marketing professional who is in charge of demonstrating a product's features to an audience or client. The promoter demonstrates how the product works, answers questions, and attempts to persuade customers or clients to purchase the product.
A corporate promoter is a company or individual who does the preliminary work associated with the formation of a company, such as its promotion, incorporation, and flotation, and solicits people to invest money in the company, typically when it is in the process of being formed.