When you are creating an event, you can decide how and when impacts can be created for this event through the Disable User Impacts setting.
To find this setting, create or edit an event and then click on Impact Settings from the left-hand menu.
Scroll down until you see "Disable User Impacts":
You will then be able to select from three options
If you select No, then user impacts will remain enabled. This means that a user can create their own impact by clicking Add Impact. Impacts can also be created through sign in/check in processes if those are enabled, and admins can add impacts manually as well.
2. Yes, Disable user impacts
If you select Yes, Disable user impact, users will not be able to create their own impacts. However, impacts can still be created through the sign in/check in processes, and admins can manually add impacts.
3. Yes, Disable all impacts
If you select Yes, Disable all impacts, users will not be able to create their own impacts, and impacts cannot be created through the sign in/check in processes. If signed in/check in, a user will not have an impact created or be marked as attended. However, if need be, admins can still manually add impacts for these events.