Hide specific calendars in widget
I've figured out what I was doing wrong.  Since I use the Outlook app for my mail, I also went into the calendar section of that to turn off the calendar I wanted to hide. So hiding it in the Outlook Calendar of course didn't work.

I went into the Apple calendar app and unselected the tv show calendar, and now it no longer shows up in the widget.

This was just a matter of hiding the calendar in the wrong app.