I’m having the same problem on my site. I noticed that the calendar events were not loading the description popup on either hover OR click, and when I inspected with Google Chrome I found the same JQuery error. I wanted to know if the JQuery error was responsible for the non-functionality of the hover/click on the calendar.
I don’t know what I need to do to fix this. I use W3 Total Cache on my site but have turned off Minify for CSS and JS as a precaution.
Site: https://www.southwesternadventist.org/calendar/swuc
Any help would be greatly appreciated.