Working on a project for a PM class and trying to come up with some numbers to include in my project for math/budgeting. Is it possible to find ROI on a simple birthday party ? If the overall budget for the party per the client is 9000$, what sorts of numbers can be generated ? Planning is in a 6 week time frame and this is being planned by an ' event company ' that is fictional, so any additional numbers are open to imagination.