By default, event notifications are sent to the event organizer (as well as the volunteer). The event organizer configures who receives what alert, but to reassign an alert to be sent to a different organizer, you will need to change the event organizer. Here's how:
On your initial dashboard, go to Event Sign-Ups.
Select your event
Click on Edit under the Manage column
Click on Permissions and Configurations to Expand
Under Organizer, use the drop down to select a new organizer who will receive notifications moving forward.
Click on Save when finished.