To get an overview of your participant activity in Vito, just click Admin.
From there, you'll reach the hub Overview page where you can see how many participants have been active in your hub over time, as well as the total number of participants.
On the graph, the X axis will give you a timeline, and the Y axis will show the number of visits. The date range that this data covers will also be displayed below the graph. This graph will also show you what your peak number of views was.