If you create a new event, you have to fill in where the location takes place (https://bit.ly/2ek2BlU). These location-related fields (Region, City, etc.) are used to filter the event list at the frontend. Onced you filled in a term in the wrong field and saved the event, this term appears in the wrong select list at the event search at the frontend (https://bit.ly/2dFIwDL) – even after correcting the mistake. You’ll see it when you search for the term and no events are found.