Hi there,
Thanks for email support and sorry you are having issues. Sounds like there is a conflict. First, I would complete disconnect Eventbrite at Events > Settings API and reconnect. If that doesn’t work then there could be a conflict with another plugin. To test for conflicts, please make sure you are using the most current versions of all of our plugins. You can also try reinstalling them by following these instructions. If that doesn’t help, the next step in troubleshooting this is going to be testing for conflicts with your theme and other plugins (with WP_DEBUG enabled). If you need a testing environment, the free WP Staging plugin will let you create a quick copy of your live site that you can use for testing.
Let me know what you find.
Would you be willing to share your system information? That will allow me to check for possible conflicts and see your current calendar settings. You can snag that by heading to Events > Help, copying the information that is at the bottom of the screen, then paste it here for me as a private reply.
Thanks,
Brendan