Hi. Sorry you’re experiencing this.
Please provide the link to the Eventbrite URL you are trying to import.
Additionally, please provide a site export / database dump.
Please use the Duplicator plugin to create a full backup (files and database — please check the box to exclude the uploads folder if it’s large) and link me to download it in a Private Reply (such as via a Dropbox link).
I might then be able to try and replicate the issue on my own testing server with your site’s files and database.
Thank you.