Extended fields for events
Besides the possibility of creating a specific field for Courses or Itineraries, you can create a specific field for Events too.
The process is the same as for the other entities. When creating or editing a new item in the Setting → Extended Fields section, in the Entities option click on Events. This way the field is assigned exclusively to this type of content.
Remember that it is mandatory to select an entity type, and that only one of them can be selected.