The overview provides an overall idea of your events numbers, it helps keeping a control on the events analytics and on how fast an event is being booked up.
The overview provides a visually pleasant event breakdown and allows events organisers to share feedback loop for marketing. Attendance numbers can in fact help you measuring the appetite for certain events and to adjust marketing and PR accordingly.
The overview can be applied on both single events and entire collections. Not sure what collections are? Find out more about this Pro feature in this article.