Good afternoon David and welcome back!
Thank you for reaching out to us.
We are sorry to hear about your calendar not showing up on you site.
I would love to help you with this topic.
The very first thing I would recommend is trying out the different Events Template settings under Events -> Settings -> Display to see if that helps.
If that does not work. Try temporarily reverting back to a default WordPress theme such as twenty-sixteen to see if that helps.
Let me know how that goes.
Best regards,
Geoff B.