Hi Andras, I just wanted to let you know that I’ve actually resolved this, and thought it might be useful for other WPML/Eventbrite users. Here’s what WPML told me to do:
1- Go to WPML>Translation Management>Multilingual Content Setup>custom fields translation
2- Search for fields related to eventbrite there. If you don’t see them, try clicking ‘show system fields’ link to get a full list of meta fields.
3- If you find them, select their ‘copy’ option and save these settings
4- Try to update or translate your original page again and see if these fields get copied to the translation.
This worked for me.
Thanks,
Eowyn