I was able to fix my calendar. I deactivated the Contact Form plug in and found that the calendar worked. It appears that Pirateforms installed a new version last week, so installing the previous version fixed the problem. There may be a better solution…i.e. installing a new calendar plug in, but I was happy with the way things were working previously, so this solution works for me.
Here are the instructions I followed….
I installed version 2.4.0 which is the version just before the new one.
Hope this helps someone else. I am not terrible computer savvy, but I can follow instructions!