In a video delivery context, collection and analysis of viewing data can provide insight into viewer interaction with video and the Internet. The viewing data can be transmitted in a controlled manner to a data repository. Disclosed herein are system, method, and computer program product embodiments for optimizing inventory based on predicted viewership. An example embodiment operates by evaluating past viewership data for a periodic event, determining a tendency of a market segment to view the periodic event, and predicting viewership for a future event based on the determined tendency.