There is no reason that your events should be wiped out.
Was this option selected when you upgraded to new version? You can also try eventon settings > diagnose to make sure emails are going through on your website.
Replies for tickets on suppota
Please update to latest version RSVP 2.6.5 and if the issue still continue annabelle please send us a new ticket as this original ticket is a year old.
Done, you can access as administrator
Hello Igor,
Can you give us administrator-level privilege for the username/password you have provided please?
We could not access some section in the dashboard.
Thank You

Excuse me for not explaining, if I already have version 2.6.17 installed the PDFer plugin I just acquired it today.
When activating it, it indicates the message of the title of this Post “EventON PDFer requires EventON RSVP addon version 2.6.1 or higher to fully function please update RSVP addon!”.
My EventOn Plugin is updated for several days in version 2.6.17.
The PDFer Plugin should appear in the “Addons & Licenses” section, when I edit an event in the column, the options to edit the ticket do not appear.
Thanks for your answer
Hello,
To update eventon addons: You can download latest eventon addons from myeventon > my account. Then you can go to your website, deactivate old addon and install new one and activate then delete the old addon. This link will further explain the process. Also you can follow us on twitter to get real-time announcements on updates!
Hi,
let us know if it worked out for you please 🙂
Thank you for the message here is the fix. Please replace this message into booking addon “includes” folder
https://www.dropbox.com/s/kafl312ymii4c9i/class-integration-tickets.php?dl=0
Hello,
Please follow the instructions in this documentation to activate debug in your site to see any PHP errors recorded that can provide insight on to whats going on. Please reply with a link to debug.log file. If you are not able to do this please send us FTP access to your site so we can do this for you.
Please also try to follow this guide https://docs.myeventon.com/documentations/increasing-wordpress-memory-limit/
That would be a very tedious process. I would strongly suggest you try my other suggestions first.
1. switch to default wordpress theme and verify if issue still exists
2. deactivate other plugins one by one and verify if issue exists
3. create a new wordpress installation with only eventon and woocommerce and verify the issue