Hello,
Thanks for reaching out – I’m sorry you’re not able to publish to Eventbrite!
I did some testing on my end but was not able to recreate this issue. Is this something that was working on your site before and has recently stopped working? If you haven’t done so already, please also run through the steps outlined in this article (with WP_DEBUG enabled) to check for conflicts with your theme and other plugins. If you need a testing environment to do this in, the free WP Staging plugin will let you create a quick copy of your live site that you can use for testing.
I would also recommend reviewing these instructions to make sure that everything is configured correctly to integrate with Eventbrite.
Please let me know what you find!