Hi Mary,
I’m sorry that you’re running into this issue with your calendar, but I’ll be happy to help you figure out what’s going on!
Did this happen initially when you tried to run an update? If so, it’s possible that something went wrong during the update and you will need to manually delete and re-upload the plugins via FTP – you can find instructions on this here. Can you give this a try and let me know if this gets your calendar back?
If not, can you send me a screenshot of what you see for these two plugins (The Events Calendar and Events Calendar Pro) in the Plugins section of your Dashboard? Can you also share your system information with me?
Thanks,
Jennifer