I have a few problems with the import function. Mainly if I change a name of an event an import the new csv-Data, the events calendar shows both events on the same time (with the old and the new name)
Is there an option to delete all entries in the events calendar and then import the new .csv Data?
Unfortunately that isn’t something that we currently have built as an option with our plugin. However, you could try a third-party plugin such as https://wordpress.org/plugins/bulk-delete/ to accomplish this prior to initializing a new import.