You can get information on events from various places, by:
Clicking on the Info... button on the main C3 window.
This gives details for all systems of:
total events received so far
average events received per minute
the total events received for each priority -- the event distribution
Clicking on the Info... button on the group window, which gives the event totals for each priority for the group.
Clicking the right mouse button on a system icon, and selecting Information... from the pop-up menu. This gives the event totals for each priority for that system.