Hello,
Sorry to hear that you’re running into this issue with Event Tickets! As a first step, can you try upgrading to the current versions of both Event Tickets and Event Tickets Plus (4.8.1) at the same time (running different versions can sometimes cause problems)? You might need to delete both and then update them manually, at the same time (don’t activate one until both are at the same version).
If that doesn’t help, can you try activating the current versions of both plugins in a default environment (all other plugins deactivated and a default theme like Twentyseventeen enabled) to see if your site is still crashing? If not, you’ll want to reactivate your theme and other plugins one at a time until the problem reappears. Please make sure to have WP_DEBUG enabled while testing and copy/paste any errors that you see into your reply.
If you don’t have a testing site already, the free Duplicator or WP Staging plugins can help you get one set up. Can you also share your system information with me?
Thanks,
Jennifer