Scenario: In the Events data import, there is a field to identify where the event will take place. The column header for that field is "location". If it is misspelled ("locaiton") in the data import file, then that entire column for all records will be ignored during the import process. End result will be that none of the imported Events will their location populated. And you cannot use data import to update existing events.

What is the Best Practice for Data Import?