Hello,
I’m sorry that you’re running into this issue, but I’ll be happy to help you figure out what’s going on.
First, can you please try running through these steps to test for any conflicts that may be occurring with your theme or another plugin? If you don’t have a testing site already, the WP Staging plugin will let you create a quick copy of your live site that you can use for testing. Please let me know what you find!
Can you share your system info with me as well, along with a link to the event submission page on the front end?
Thanks,
Jennifer