Why Isn't My Event Showing Up in Overall Attendance?
When you create an event service time you have the option to include or exclude the entered data from the dashboard and reports. See Event Option - Include in Regular Reports
If that option is turned on after saving records, then the saved records won't show up on the dashboard.
This is because when you save entries on the input screen, it copies the option "Include in regular reports" to the records. Changing the service definition after that doesn't update the records.
Fortunately the solution is easy:
1) Make sure the "Include in regular reports" option is on (or off) as desired.
2) On the input screen, find the event entry.
3) Change all the saved numbers - e.g. add "999" in front. Save. Change them back and save again.