After you have added an Event Tag or multiple Event Tags, you can later remove any of these tags you no longer want to be applied to your Event. If it is a repeating Event you can remove the Event Tag from one Event or all of the repeating Events.
To remove the tag from your Event, all you need to do is click on your Event Tag (in the example below this is the “Phone Call” tag) in the Event editor box and click on the box next to the Event Tag to un-check it. Follow the steps in the image below: