The 'start' is the count it begins with.

The 'Surge Point' is definable with the amount of attendees and the time.

In this example, the 'surge point' is not defined properly, as the decline in attendees is not natural. The 'Surge Point Time' is set to 5 minutes, so the 'Surge Point' should be more than 98 (start). That way it will increase, as opposed to how it shows here.
The 'peak' of 141 attendees should be set at the 'peak time' of around the CTA / pitch.