How to turn off notifications for a specific event in the calendar?
There are two places where you will need to disable this.


As @howdytom explained, set alert to None when editing your event. Calendar will ask you to save this change for all future events.





Calendar creates automatic alerts for your events. To change those, go to Calendar → Preferences → Alerts and disable automatic alerts by setting them to None. Once you do this, this will affect automatic alerts for ALL events, and you will need to set them on an event-by-event basis.