Hello,
Thanks for reaching out!
Unfortunately I think you will need the venue ID in order to associate an existing venue with the event…The venue information is actually stored as a separate entity from the event, and the only venue information stored on the event itself is the venue ID. If you look through the available fields in WP Import, _EventVenueID is the only venue field available. If you want to find the venue ID for an existing venue, you can go under Events > Venues and click on the venue – the ID will be in the URL (post=ID – see screenshot).
We are a bit limited in the amount of support that we can provide for third party plugins, but I hope this helps! Please let me know if you have any other questions!
Thanks,
Jennifer