Good evening Priscilla and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
We are sorry to hear about the error 500 plaguing your site. Yikes!
I would love to help you with this topic.
The first thing I would recommend is upgrading to the very latest version of our plugins (a maintenance release containing tweaks for EDD was made available today).
Secondly, I would advise going through the following article to see if that helps: http://www.wpbeginner.com/wp-tutorials/how-to-fix-the-internal-server-error-in-wordpress/
The reason for these suggestions is that I am not able to reproduce the issue on my end.
Thirdly, I am noticing that the memory limit on your server returns an unusual value (memory_limit = 268435456) you might want to check that.
Finally, I would recommend temporarily deactivating the third-party the Events Calendar shortcodes plugin to see if that helps.
If all of that fails, could you provide me with credentials to your staging environment (via a private reply) ?
Hang in there!
Geoff B.