The event tags allow you to quickly locate events.

Adding and assigning a tag to an event is very fast and very simple. In Events > Create Event, underneath the event description, there will be a Tags field. 

In order to add a new tag, you simply need to start typing in the field. If the tag does not exist yet, you can click on the + button to both create and assign the tag to the event.

By going to Events > Tags, you can edit or delete existing tags.